Auto merge of #68423 - Centril:rollup-bdjykrv, r=Centril
Rollup of 7 pull requests
Successful merges:
- #67686 (Simplify NodeHeader by avoiding slices in BTreeMaps with shared roots)
- #68140 (Implement `?const` opt-out for trait bounds)
- #68313 (Options IP_MULTICAST_TTL and IP_MULTICAST_LOOP are 1 byte on BSD)
- #68328 (Actually pass target LLVM args to LLVM)
- #68399 (check_match: misc unifications and ICE fixes)
- #68415 (tidy: fix most clippy warnings)
- #68416 (lowering: cleanup some hofs)
Failed merges:
r? @ghost
diff --git a/Cargo.lock b/Cargo.lock
index 48bc269..cbb40f4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3763,6 +3763,7 @@
"rustc_hir",
"rustc_index",
"rustc_macros",
+ "rustc_session",
"rustc_span",
"rustc_target",
"serialize",
diff --git a/src/liballoc/collections/btree/map.rs b/src/liballoc/collections/btree/map.rs
index 302c2bc..e70f881 100644
--- a/src/liballoc/collections/btree/map.rs
+++ b/src/liballoc/collections/btree/map.rs
@@ -1968,7 +1968,7 @@
(i, false) => i,
},
(_, Unbounded) => 0,
- (true, Included(_)) => min_node.keys().len(),
+ (true, Included(_)) => min_node.len(),
(true, Excluded(_)) => 0,
};
@@ -1987,9 +1987,9 @@
}
(i, false) => i,
},
- (_, Unbounded) => max_node.keys().len(),
+ (_, Unbounded) => max_node.len(),
(true, Included(_)) => 0,
- (true, Excluded(_)) => max_node.keys().len(),
+ (true, Excluded(_)) => max_node.len(),
};
if !diverged {
diff --git a/src/liballoc/collections/btree/node.rs b/src/liballoc/collections/btree/node.rs
index f40e0b0..d9cdebb 100644
--- a/src/liballoc/collections/btree/node.rs
+++ b/src/liballoc/collections/btree/node.rs
@@ -54,10 +54,8 @@
/// `NodeHeader` because we do not want unnecessary padding between `len` and the keys.
/// Crucially, `NodeHeader` can be safely transmuted to different K and V. (This is exploited
/// by `as_header`.)
-/// See `into_key_slice` for an explanation of K2. K2 cannot be safely transmuted around
-/// because the size of `NodeHeader` depends on its alignment!
#[repr(C)]
-struct NodeHeader<K, V, K2 = ()> {
+struct NodeHeader<K, V> {
/// We use `*const` as opposed to `*mut` so as to be covariant in `K` and `V`.
/// This either points to an actual node or is null.
parent: *const InternalNode<K, V>,
@@ -72,9 +70,6 @@
/// This next to `parent_idx` to encourage the compiler to join `len` and
/// `parent_idx` into the same 32-bit word, reducing space overhead.
len: u16,
-
- /// See `into_key_slice`.
- keys_start: [K2; 0],
}
#[repr(C)]
struct LeafNode<K, V> {
@@ -128,7 +123,7 @@
// We use just a header in order to save space, since no operation on an empty tree will
// ever take a pointer past the first key.
static EMPTY_ROOT_NODE: NodeHeader<(), ()> =
- NodeHeader { parent: ptr::null(), parent_idx: MaybeUninit::uninit(), len: 0, keys_start: [] };
+ NodeHeader { parent: ptr::null(), parent_idx: MaybeUninit::uninit(), len: 0 };
/// The underlying representation of internal nodes. As with `LeafNode`s, these should be hidden
/// behind `BoxedNode`s to prevent dropping uninitialized keys and values. Any pointer to an
@@ -390,14 +385,13 @@
}
/// Borrows a view into the keys stored in the node.
- /// Works on all possible nodes, including the shared root.
- pub fn keys(&self) -> &[K] {
+ /// The caller must ensure that the node is not the shared root.
+ pub unsafe fn keys(&self) -> &[K] {
self.reborrow().into_key_slice()
}
/// Borrows a view into the values stored in the node.
/// The caller must ensure that the node is not the shared root.
- /// This function is not public, so doesn't have to support shared roots like `keys` does.
fn vals(&self) -> &[V] {
self.reborrow().into_val_slice()
}
@@ -515,7 +509,6 @@
}
/// The caller must ensure that the node is not the shared root.
- /// This function is not public, so doesn't have to support shared roots like `keys` does.
fn keys_mut(&mut self) -> &mut [K] {
unsafe { self.reborrow_mut().into_key_slice_mut() }
}
@@ -527,48 +520,11 @@
}
impl<'a, K: 'a, V: 'a, Type> NodeRef<marker::Immut<'a>, K, V, Type> {
- fn into_key_slice(self) -> &'a [K] {
- // We have to be careful here because we might be pointing to the shared root.
- // In that case, we must not create an `&LeafNode`. We could just return
- // an empty slice whenever the length is 0 (this includes the shared root),
- // but we want to avoid that run-time check.
- // Instead, we create a slice pointing into the node whenever possible.
- // We can sometimes do this even for the shared root, as the slice will be
- // empty and `NodeHeader` contains an empty `keys_start` array.
- // We cannot *always* do this because:
- // - `keys_start` is not correctly typed because we want `NodeHeader`'s size to
- // not depend on the alignment of `K` (needed because `as_header` should be safe).
- // For this reason, `NodeHeader` has this `K2` parameter (that's usually `()`
- // and hence just adds a size-0-align-1 field, not affecting layout).
- // If the correctly typed header is more highly aligned than the allocated header,
- // we cannot transmute safely.
- // - Even if we can transmute, the offset of a correctly typed `keys_start` might
- // be different and outside the bounds of the allocated header!
- // So we do an alignment check and a size check first, that will be evaluated
- // at compile-time, and only do any run-time check in the rare case that
- // the compile-time checks signal danger.
- if (mem::align_of::<NodeHeader<K, V, K>>() > mem::align_of::<NodeHeader<K, V>>()
- || mem::size_of::<NodeHeader<K, V, K>>() != mem::size_of::<NodeHeader<K, V>>())
- && self.is_shared_root()
- {
- &[]
- } else {
- // If we are a `LeafNode<K, V>`, we can always transmute to
- // `NodeHeader<K, V, K>` and `keys_start` always has the same offset
- // as the actual `keys`.
- // Thanks to the checks above, we know that we can transmute to
- // `NodeHeader<K, V, K>` and that `keys_start` will be
- // in-bounds of some allocation even if this is the shared root!
- // (We might be one-past-the-end, but that is allowed by LLVM.)
- // Thus we can use `NodeHeader<K, V, K>`
- // to compute the pointer where the keys start.
- // This entire hack will become unnecessary once
- // <https://github.com/rust-lang/rfcs/pull/2582> lands, then we can just take a raw
- // pointer to the `keys` field of `*const InternalNode<K, V>`.
- let header = self.as_header() as *const _ as *const NodeHeader<K, V, K>;
- let keys = unsafe { &(*header).keys_start as *const _ as *const K };
- unsafe { slice::from_raw_parts(keys, self.len()) }
- }
+ /// The caller must ensure that the node is not the shared root.
+ unsafe fn into_key_slice(self) -> &'a [K] {
+ debug_assert!(!self.is_shared_root());
+ // We cannot be the shared root, so `as_leaf` is okay.
+ slice::from_raw_parts(MaybeUninit::first_ptr(&self.as_leaf().keys), self.len())
}
/// The caller must ensure that the node is not the shared root.
@@ -578,9 +534,10 @@
unsafe { slice::from_raw_parts(MaybeUninit::first_ptr(&self.as_leaf().vals), self.len()) }
}
+ /// The caller must ensure that the node is not the shared root.
fn into_slices(self) -> (&'a [K], &'a [V]) {
let k = unsafe { ptr::read(&self) };
- (k.into_key_slice(), self.into_val_slice())
+ (unsafe { k.into_key_slice() }, self.into_val_slice())
}
}
diff --git a/src/liballoc/collections/btree/search.rs b/src/liballoc/collections/btree/search.rs
index 48cbf67..579624c 100644
--- a/src/liballoc/collections/btree/search.rs
+++ b/src/liballoc/collections/btree/search.rs
@@ -61,16 +61,18 @@
{
// This function is defined over all borrow types (immutable, mutable, owned),
// and may be called on the shared root in each case.
- // Crucially, we use `keys()` here, i.e., we work with immutable data.
- // `keys_mut()` does not support the shared root, so we cannot use it.
// Using `keys()` is fine here even if BorrowType is mutable, as all we return
// is an index -- not a reference.
- for (i, k) in node.keys().iter().enumerate() {
- match key.cmp(k.borrow()) {
- Ordering::Greater => {}
- Ordering::Equal => return (i, true),
- Ordering::Less => return (i, false),
+ let len = node.len();
+ if len > 0 {
+ let keys = unsafe { node.keys() }; // safe because a non-empty node cannot be the shared root
+ for (i, k) in keys.iter().enumerate() {
+ match key.cmp(k.borrow()) {
+ Ordering::Greater => {}
+ Ordering::Equal => return (i, true),
+ Ordering::Less => return (i, false),
+ }
}
}
- (node.keys().len(), false)
+ (len, false)
}
diff --git a/src/librustc/traits/auto_trait.rs b/src/librustc/traits/auto_trait.rs
index 89b28ae..c97c5c2 100644
--- a/src/librustc/traits/auto_trait.rs
+++ b/src/librustc/traits/auto_trait.rs
@@ -337,7 +337,10 @@
&Err(SelectionError::Unimplemented) => {
if self.is_param_no_infer(pred.skip_binder().trait_ref.substs) {
already_visited.remove(&pred);
- self.add_user_pred(&mut user_computed_preds, ty::Predicate::Trait(pred));
+ self.add_user_pred(
+ &mut user_computed_preds,
+ ty::Predicate::Trait(pred, ast::Constness::NotConst),
+ );
predicates.push_back(pred);
} else {
debug!(
@@ -405,7 +408,7 @@
let mut should_add_new = true;
user_computed_preds.retain(|&old_pred| {
match (&new_pred, old_pred) {
- (&ty::Predicate::Trait(new_trait), ty::Predicate::Trait(old_trait)) => {
+ (&ty::Predicate::Trait(new_trait, _), ty::Predicate::Trait(old_trait, _)) => {
if new_trait.def_id() == old_trait.def_id() {
let new_substs = new_trait.skip_binder().trait_ref.substs;
let old_substs = old_trait.skip_binder().trait_ref.substs;
@@ -627,7 +630,7 @@
// We check this by calling is_of_param on the relevant types
// from the various possible predicates
match &predicate {
- &ty::Predicate::Trait(p) => {
+ &ty::Predicate::Trait(p, _) => {
if self.is_param_no_infer(p.skip_binder().trait_ref.substs)
&& !only_projections
&& is_new_pred
diff --git a/src/librustc/traits/engine.rs b/src/librustc/traits/engine.rs
index 5b80448..84bfc86 100644
--- a/src/librustc/traits/engine.rs
+++ b/src/librustc/traits/engine.rs
@@ -1,6 +1,6 @@
use crate::infer::InferCtxt;
use crate::traits::Obligation;
-use crate::ty::{self, ToPredicate, Ty, TyCtxt};
+use crate::ty::{self, ToPredicate, Ty, TyCtxt, WithConstness};
use rustc_hir::def_id::DefId;
use super::{ChalkFulfillmentContext, FulfillmentContext, FulfillmentError};
@@ -33,7 +33,7 @@
cause,
recursion_depth: 0,
param_env,
- predicate: trait_ref.to_predicate(),
+ predicate: trait_ref.without_const().to_predicate(),
},
);
}
diff --git a/src/librustc/traits/error_reporting/mod.rs b/src/librustc/traits/error_reporting/mod.rs
index 646cb80..d1c369d 100644
--- a/src/librustc/traits/error_reporting/mod.rs
+++ b/src/librustc/traits/error_reporting/mod.rs
@@ -19,7 +19,9 @@
use crate::ty::fast_reject;
use crate::ty::fold::TypeFolder;
use crate::ty::SubtypePredicate;
-use crate::ty::{self, AdtKind, ToPolyTraitRef, ToPredicate, Ty, TyCtxt, TypeFoldable};
+use crate::ty::{
+ self, AdtKind, ToPolyTraitRef, ToPredicate, Ty, TyCtxt, TypeFoldable, WithConstness,
+};
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder};
@@ -128,7 +130,7 @@
}
let (cond, error) = match (cond, error) {
- (&ty::Predicate::Trait(..), &ty::Predicate::Trait(ref error)) => (cond, error),
+ (&ty::Predicate::Trait(..), &ty::Predicate::Trait(ref error, _)) => (cond, error),
_ => {
// FIXME: make this work in other cases too.
return false;
@@ -136,7 +138,7 @@
};
for implication in super::elaborate_predicates(self.tcx, vec![cond.clone()]) {
- if let ty::Predicate::Trait(implication) = implication {
+ if let ty::Predicate::Trait(implication, _) = implication {
let error = error.to_poly_trait_ref();
let implication = implication.to_poly_trait_ref();
// FIXME: I'm just not taking associated types at all here.
@@ -528,7 +530,7 @@
return;
}
match obligation.predicate {
- ty::Predicate::Trait(ref trait_predicate) => {
+ ty::Predicate::Trait(ref trait_predicate, _) => {
let trait_predicate = self.resolve_vars_if_possible(trait_predicate);
if self.tcx.sess.has_errors() && trait_predicate.references_error() {
@@ -581,7 +583,7 @@
"{}",
message.unwrap_or_else(|| format!(
"the trait bound `{}` is not satisfied{}",
- trait_ref.to_predicate(),
+ trait_ref.without_const().to_predicate(),
post_message,
))
);
@@ -693,7 +695,10 @@
trait_pred
});
let unit_obligation = Obligation {
- predicate: ty::Predicate::Trait(predicate),
+ predicate: ty::Predicate::Trait(
+ predicate,
+ ast::Constness::NotConst,
+ ),
..obligation.clone()
};
if self.predicate_may_hold(&unit_obligation) {
@@ -986,7 +991,7 @@
) -> PredicateObligation<'tcx> {
let new_trait_ref =
ty::TraitRef { def_id, substs: self.tcx.mk_substs_trait(output_ty, &[]) };
- Obligation::new(cause, param_env, new_trait_ref.to_predicate())
+ Obligation::new(cause, param_env, new_trait_ref.without_const().to_predicate())
}
}
@@ -1074,7 +1079,7 @@
}
let mut err = match predicate {
- ty::Predicate::Trait(ref data) => {
+ ty::Predicate::Trait(ref data, _) => {
let trait_ref = data.to_poly_trait_ref();
let self_ty = trait_ref.self_ty();
debug!("self_ty {:?} {:?} trait_ref {:?}", self_ty, self_ty.kind, trait_ref);
@@ -1267,8 +1272,11 @@
)
.value;
- let obligation =
- Obligation::new(ObligationCause::dummy(), param_env, cleaned_pred.to_predicate());
+ let obligation = Obligation::new(
+ ObligationCause::dummy(),
+ param_env,
+ cleaned_pred.without_const().to_predicate(),
+ );
self.predicate_may_hold(&obligation)
})
diff --git a/src/librustc/traits/error_reporting/suggestions.rs b/src/librustc/traits/error_reporting/suggestions.rs
index c18e175..4559007 100644
--- a/src/librustc/traits/error_reporting/suggestions.rs
+++ b/src/librustc/traits/error_reporting/suggestions.rs
@@ -6,7 +6,7 @@
use crate::infer::InferCtxt;
use crate::traits::object_safety::object_safety_violations;
use crate::ty::TypeckTables;
-use crate::ty::{self, AdtKind, DefIdTree, ToPredicate, Ty, TyCtxt, TypeFoldable};
+use crate::ty::{self, AdtKind, DefIdTree, ToPredicate, Ty, TyCtxt, TypeFoldable, WithConstness};
use rustc_errors::{
error_code, pluralize, struct_span_err, Applicability, DiagnosticBuilder, Style,
@@ -48,7 +48,7 @@
} else {
" where"
},
- trait_ref.to_predicate(),
+ trait_ref.without_const().to_predicate(),
),
Applicability::MachineApplicable,
);
@@ -338,8 +338,11 @@
let new_self_ty = self.tcx.mk_imm_ref(self.tcx.lifetimes.re_static, self_ty);
let substs = self.tcx.mk_substs_trait(new_self_ty, &[]);
let new_trait_ref = ty::TraitRef::new(obligation.parent_trait_ref.def_id(), substs);
- let new_obligation =
- Obligation::new(ObligationCause::dummy(), param_env, new_trait_ref.to_predicate());
+ let new_obligation = Obligation::new(
+ ObligationCause::dummy(),
+ param_env,
+ new_trait_ref.without_const().to_predicate(),
+ );
if self.predicate_must_hold_modulo_regions(&new_obligation) {
if let Ok(snippet) = self.tcx.sess.source_map().span_to_snippet(span) {
// We have a very specific type of error, where just borrowing this argument
@@ -1120,7 +1123,7 @@
// the type. The last generator has information about where the bound was introduced. At
// least one generator should be present for this diagnostic to be modified.
let (mut trait_ref, mut target_ty) = match obligation.predicate {
- ty::Predicate::Trait(p) => {
+ ty::Predicate::Trait(p, _) => {
(Some(p.skip_binder().trait_ref), Some(p.skip_binder().self_ty()))
}
_ => (None, None),
@@ -1543,7 +1546,7 @@
err.note(&format!("required because it appears within the type `{}`", ty));
obligated_types.push(ty);
- let parent_predicate = parent_trait_ref.to_predicate();
+ let parent_predicate = parent_trait_ref.without_const().to_predicate();
if !self.is_recursive_obligation(obligated_types, &data.parent_code) {
self.note_obligation_cause_code(
err,
@@ -1560,7 +1563,7 @@
parent_trait_ref.print_only_trait_path(),
parent_trait_ref.skip_binder().self_ty()
));
- let parent_predicate = parent_trait_ref.to_predicate();
+ let parent_predicate = parent_trait_ref.without_const().to_predicate();
self.note_obligation_cause_code(
err,
&parent_predicate,
diff --git a/src/librustc/traits/fulfill.rs b/src/librustc/traits/fulfill.rs
index 46ece6f..0aac6fb 100644
--- a/src/librustc/traits/fulfill.rs
+++ b/src/librustc/traits/fulfill.rs
@@ -311,7 +311,7 @@
}
match obligation.predicate {
- ty::Predicate::Trait(ref data) => {
+ ty::Predicate::Trait(ref data, _) => {
let trait_obligation = obligation.with(data.clone());
if data.is_global() {
diff --git a/src/librustc/traits/mod.rs b/src/librustc/traits/mod.rs
index e935291..daaba95 100644
--- a/src/librustc/traits/mod.rs
+++ b/src/librustc/traits/mod.rs
@@ -29,7 +29,7 @@
use crate::ty::error::{ExpectedFound, TypeError};
use crate::ty::fold::{TypeFoldable, TypeFolder, TypeVisitor};
use crate::ty::subst::{InternalSubsts, SubstsRef};
-use crate::ty::{self, AdtKind, GenericParamDefKind, List, ToPredicate, Ty, TyCtxt};
+use crate::ty::{self, AdtKind, GenericParamDefKind, List, ToPredicate, Ty, TyCtxt, WithConstness};
use crate::util::common::ErrorReported;
use chalk_engine;
use rustc_hir as hir;
@@ -732,7 +732,7 @@
param_env,
cause: ObligationCause::misc(span, hir::DUMMY_HIR_ID),
recursion_depth: 0,
- predicate: trait_ref.to_predicate(),
+ predicate: trait_ref.without_const().to_predicate(),
};
let result = infcx.predicate_must_hold_modulo_regions(&obligation);
diff --git a/src/librustc/traits/object_safety.rs b/src/librustc/traits/object_safety.rs
index ce57fb8..15f81bb 100644
--- a/src/librustc/traits/object_safety.rs
+++ b/src/librustc/traits/object_safety.rs
@@ -12,7 +12,7 @@
use crate::traits::{self, Obligation, ObligationCause};
use crate::ty::subst::{InternalSubsts, Subst};
-use crate::ty::{self, Predicate, ToPredicate, Ty, TyCtxt, TypeFoldable};
+use crate::ty::{self, Predicate, ToPredicate, Ty, TyCtxt, TypeFoldable, WithConstness};
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
use rustc_session::lint::builtin::WHERE_CLAUSES_OBJECT_SAFETY;
@@ -234,7 +234,7 @@
.map(|(predicate, _)| predicate.subst_supertrait(tcx, &trait_ref))
.any(|predicate| {
match predicate {
- ty::Predicate::Trait(ref data) => {
+ ty::Predicate::Trait(ref data, _) => {
// In the case of a trait predicate, we can skip the "self" type.
data.skip_binder().input_types().skip(1).any(has_self_ty)
}
@@ -285,7 +285,7 @@
let predicates = tcx.predicates_of(def_id);
let predicates = predicates.instantiate_identity(tcx).predicates;
elaborate_predicates(tcx, predicates).any(|predicate| match predicate {
- ty::Predicate::Trait(ref trait_pred) => {
+ ty::Predicate::Trait(ref trait_pred, _) => {
trait_pred.def_id() == sized_def_id && trait_pred.skip_binder().self_ty().is_param(0)
}
ty::Predicate::Projection(..)
@@ -585,6 +585,7 @@
def_id: unsize_did,
substs: tcx.mk_substs_trait(tcx.types.self_param, &[unsized_self_ty.into()]),
}
+ .without_const()
.to_predicate();
// U: Trait<Arg1, ..., ArgN>
@@ -598,7 +599,7 @@
}
});
- ty::TraitRef { def_id: unsize_did, substs }.to_predicate()
+ ty::TraitRef { def_id: unsize_did, substs }.without_const().to_predicate()
};
let caller_bounds: Vec<Predicate<'tcx>> = param_env
@@ -620,6 +621,7 @@
def_id: dispatch_from_dyn_did,
substs: tcx.mk_substs_trait(receiver_ty, &[unsized_receiver_ty.into()]),
}
+ .without_const()
.to_predicate();
Obligation::new(ObligationCause::dummy(), param_env, predicate)
diff --git a/src/librustc/traits/project.rs b/src/librustc/traits/project.rs
index 5bc211a..62672a7 100644
--- a/src/librustc/traits/project.rs
+++ b/src/librustc/traits/project.rs
@@ -16,7 +16,7 @@
use crate::infer::{InferCtxt, InferOk, LateBoundRegionConversionTime};
use crate::ty::fold::{TypeFoldable, TypeFolder};
use crate::ty::subst::{InternalSubsts, Subst};
-use crate::ty::{self, ToPolyTraitRef, ToPredicate, Ty, TyCtxt};
+use crate::ty::{self, ToPolyTraitRef, ToPredicate, Ty, TyCtxt, WithConstness};
use rustc_data_structures::snapshot_map::{Snapshot, SnapshotMap};
use rustc_hir::def_id::DefId;
use rustc_macros::HashStable;
@@ -738,7 +738,12 @@
depth: usize,
) -> PredicateObligation<'tcx> {
let trait_ref = projection_ty.trait_ref(infcx.tcx).to_poly_trait_ref();
- Obligation { cause, recursion_depth: depth, param_env, predicate: trait_ref.to_predicate() }
+ Obligation {
+ cause,
+ recursion_depth: depth,
+ param_env,
+ predicate: trait_ref.without_const().to_predicate(),
+ }
}
/// If we are projecting `<T as Trait>::Item`, but `T: Trait` does not
@@ -772,7 +777,7 @@
cause,
recursion_depth: depth,
param_env,
- predicate: trait_ref.to_predicate(),
+ predicate: trait_ref.without_const().to_predicate(),
};
let tcx = selcx.infcx().tcx;
let def_id = projection_ty.item_def_id;
diff --git a/src/librustc/traits/query/type_op/prove_predicate.rs b/src/librustc/traits/query/type_op/prove_predicate.rs
index c0a0cbe..15870ec 100644
--- a/src/librustc/traits/query/type_op/prove_predicate.rs
+++ b/src/librustc/traits/query/type_op/prove_predicate.rs
@@ -24,7 +24,7 @@
// `&T`, accounts for about 60% percentage of the predicates
// we have to prove. No need to canonicalize and all that for
// such cases.
- if let Predicate::Trait(trait_ref) = key.value.predicate {
+ if let Predicate::Trait(trait_ref, _) = key.value.predicate {
if let Some(sized_def_id) = tcx.lang_items().sized_trait() {
if trait_ref.def_id() == sized_def_id {
if trait_ref.skip_binder().self_ty().is_trivially_sized(tcx) {
diff --git a/src/librustc/traits/select.rs b/src/librustc/traits/select.rs
index 3bfe542b..ac1ca4d 100644
--- a/src/librustc/traits/select.rs
+++ b/src/librustc/traits/select.rs
@@ -37,7 +37,7 @@
use crate::ty::fast_reject;
use crate::ty::relate::TypeRelation;
use crate::ty::subst::{Subst, SubstsRef};
-use crate::ty::{self, ToPolyTraitRef, ToPredicate, Ty, TyCtxt, TypeFoldable};
+use crate::ty::{self, ToPolyTraitRef, ToPredicate, Ty, TyCtxt, TypeFoldable, WithConstness};
use rustc_hir::def_id::DefId;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
@@ -51,7 +51,7 @@
use std::fmt::{self, Display};
use std::iter;
use std::rc::Rc;
-use syntax::attr;
+use syntax::{ast, attr};
pub struct SelectionContext<'cx, 'tcx> {
infcx: &'cx InferCtxt<'cx, 'tcx>,
@@ -718,7 +718,7 @@
}
match obligation.predicate {
- ty::Predicate::Trait(ref t) => {
+ ty::Predicate::Trait(ref t, _) => {
debug_assert!(!t.has_escaping_bound_vars());
let obligation = obligation.with(t.clone());
self.evaluate_trait_predicate_recursively(previous_stack, obligation)
@@ -945,7 +945,9 @@
// trait refs. This is important because it's only a cycle
// if the regions match exactly.
let cycle = stack.iter().skip(1).take_while(|s| s.depth >= cycle_depth);
- let cycle = cycle.map(|stack| ty::Predicate::Trait(stack.obligation.predicate));
+ let cycle = cycle.map(|stack| {
+ ty::Predicate::Trait(stack.obligation.predicate, ast::Constness::NotConst)
+ });
if self.coinductive_match(cycle) {
debug!("evaluate_stack({:?}) --> recursive, coinductive", stack.fresh_trait_ref);
Some(EvaluatedToOk)
@@ -1060,7 +1062,7 @@
fn coinductive_predicate(&self, predicate: ty::Predicate<'tcx>) -> bool {
let result = match predicate {
- ty::Predicate::Trait(ref data) => self.tcx().trait_is_auto(data.def_id()),
+ ty::Predicate::Trait(ref data, _) => self.tcx().trait_is_auto(data.def_id()),
_ => false,
};
debug!("coinductive_predicate({:?}) = {:?}", predicate, result);
@@ -3366,7 +3368,7 @@
tcx.require_lang_item(lang_items::SizedTraitLangItem, None),
tcx.mk_substs_trait(source, &[]),
);
- nested.push(predicate_to_obligation(tr.to_predicate()));
+ nested.push(predicate_to_obligation(tr.without_const().to_predicate()));
// If the type is `Foo + 'a`, ensure that the type
// being cast to `Foo + 'a` outlives `'a`:
diff --git a/src/librustc/traits/util.rs b/src/librustc/traits/util.rs
index f058a4d..f3bd98b 100644
--- a/src/librustc/traits/util.rs
+++ b/src/librustc/traits/util.rs
@@ -4,7 +4,7 @@
use crate::ty::outlives::Component;
use crate::ty::subst::{GenericArg, Subst, SubstsRef};
-use crate::ty::{self, ToPolyTraitRef, ToPredicate, Ty, TyCtxt};
+use crate::ty::{self, ToPolyTraitRef, ToPredicate, Ty, TyCtxt, WithConstness};
use rustc_data_structures::fx::FxHashSet;
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
@@ -13,8 +13,8 @@
fn anonymize_predicate<'tcx>(tcx: TyCtxt<'tcx>, pred: &ty::Predicate<'tcx>) -> ty::Predicate<'tcx> {
match *pred {
- ty::Predicate::Trait(ref data) => {
- ty::Predicate::Trait(tcx.anonymize_late_bound_regions(data))
+ ty::Predicate::Trait(ref data, constness) => {
+ ty::Predicate::Trait(tcx.anonymize_late_bound_regions(data), constness)
}
ty::Predicate::RegionOutlives(ref data) => {
@@ -99,14 +99,14 @@
tcx: TyCtxt<'tcx>,
trait_ref: ty::PolyTraitRef<'tcx>,
) -> Elaborator<'tcx> {
- elaborate_predicates(tcx, vec![trait_ref.to_predicate()])
+ elaborate_predicates(tcx, vec![trait_ref.without_const().to_predicate()])
}
pub fn elaborate_trait_refs<'tcx>(
tcx: TyCtxt<'tcx>,
trait_refs: impl Iterator<Item = ty::PolyTraitRef<'tcx>>,
) -> Elaborator<'tcx> {
- let predicates = trait_refs.map(|trait_ref| trait_ref.to_predicate()).collect();
+ let predicates = trait_refs.map(|trait_ref| trait_ref.without_const().to_predicate()).collect();
elaborate_predicates(tcx, predicates)
}
@@ -127,7 +127,7 @@
fn elaborate(&mut self, predicate: &ty::Predicate<'tcx>) {
let tcx = self.visited.tcx;
match *predicate {
- ty::Predicate::Trait(ref data) => {
+ ty::Predicate::Trait(ref data, _) => {
// Get predicates declared on the trait.
let predicates = tcx.super_predicates_of(data.def_id());
@@ -358,7 +358,7 @@
fn expand(&mut self, item: &TraitAliasExpansionInfo<'tcx>) -> bool {
let tcx = self.tcx;
let trait_ref = item.trait_ref();
- let pred = trait_ref.to_predicate();
+ let pred = trait_ref.without_const().to_predicate();
debug!("expand_trait_aliases: trait_ref={:?}", trait_ref);
@@ -370,13 +370,9 @@
// Don't recurse if this trait alias is already on the stack for the DFS search.
let anon_pred = anonymize_predicate(tcx, &pred);
- if item
- .path
- .iter()
- .rev()
- .skip(1)
- .any(|(tr, _)| anonymize_predicate(tcx, &tr.to_predicate()) == anon_pred)
- {
+ if item.path.iter().rev().skip(1).any(|(tr, _)| {
+ anonymize_predicate(tcx, &tr.without_const().to_predicate()) == anon_pred
+ }) {
return false;
}
@@ -471,7 +467,7 @@
fn next(&mut self) -> Option<ty::PolyTraitRef<'tcx>> {
while let Some(pred) = self.base_iterator.next() {
- if let ty::Predicate::Trait(data) = pred {
+ if let ty::Predicate::Trait(data, _) = pred {
return Some(data.to_poly_trait_ref());
}
}
@@ -545,7 +541,12 @@
trait_ref: ty::TraitRef<'tcx>,
recursion_depth: usize,
) -> PredicateObligation<'tcx> {
- Obligation { cause, param_env, recursion_depth, predicate: trait_ref.to_predicate() }
+ Obligation {
+ cause,
+ param_env,
+ recursion_depth,
+ predicate: trait_ref.without_const().to_predicate(),
+ }
}
pub fn predicate_for_trait_def(
diff --git a/src/librustc/traits/wf.rs b/src/librustc/traits/wf.rs
index 869ba53..a0cb844 100644
--- a/src/librustc/traits/wf.rs
+++ b/src/librustc/traits/wf.rs
@@ -3,7 +3,7 @@
use crate::middle::lang_items;
use crate::traits::{self, AssocTypeBoundData};
use crate::ty::subst::SubstsRef;
-use crate::ty::{self, ToPredicate, Ty, TyCtxt, TypeFoldable};
+use crate::ty::{self, ToPredicate, Ty, TyCtxt, TypeFoldable, WithConstness};
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
use rustc_span::symbol::{kw, Ident};
@@ -62,7 +62,7 @@
// (*) ok to skip binders, because wf code is prepared for it
match *predicate {
- ty::Predicate::Trait(ref t) => {
+ ty::Predicate::Trait(ref t, _) => {
wf.compute_trait_ref(&t.skip_binder().trait_ref, Elaborate::None); // (*)
}
ty::Predicate::RegionOutlives(..) => {}
@@ -245,7 +245,7 @@
}
}
}
- ty::Predicate::Trait(proj) => {
+ ty::Predicate::Trait(proj, _) => {
// An associated item obligation born out of the `trait` failed to be met.
// Point at the `impl` that failed the obligation, the associated item that
// needed to meet the obligation, and the definition of that associated item,
@@ -350,7 +350,7 @@
self.compute_trait_ref(&trait_ref, Elaborate::None);
if !data.has_escaping_bound_vars() {
- let predicate = trait_ref.to_predicate();
+ let predicate = trait_ref.without_const().to_predicate();
let cause = self.cause(traits::ProjectionWf(data));
self.out.push(traits::Obligation::new(cause, self.param_env, predicate));
}
@@ -378,7 +378,11 @@
def_id: self.infcx.tcx.require_lang_item(lang_items::SizedTraitLangItem, None),
substs: self.infcx.tcx.mk_substs_trait(subty, &[]),
};
- self.out.push(traits::Obligation::new(cause, self.param_env, trait_ref.to_predicate()));
+ self.out.push(traits::Obligation::new(
+ cause,
+ self.param_env,
+ trait_ref.without_const().to_predicate(),
+ ));
}
}
diff --git a/src/librustc/ty/fold.rs b/src/librustc/ty/fold.rs
index b16db6a..0dddca9 100644
--- a/src/librustc/ty/fold.rs
+++ b/src/librustc/ty/fold.rs
@@ -150,6 +150,15 @@
}
}
+impl TypeFoldable<'tcx> for syntax::ast::Constness {
+ fn super_fold_with<F: TypeFolder<'tcx>>(&self, _: &mut F) -> Self {
+ *self
+ }
+ fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> bool {
+ false
+ }
+}
+
/// The `TypeFolder` trait defines the actual *folding*. There is a
/// method defined for every foldable type. Each of these has a
/// default implementation that does an "identity" fold. Within each
diff --git a/src/librustc/ty/mod.rs b/src/librustc/ty/mod.rs
index 3040ecf..0470ab2 100644
--- a/src/librustc/ty/mod.rs
+++ b/src/librustc/ty/mod.rs
@@ -52,7 +52,7 @@
use std::ops::Range;
use std::slice;
use std::{mem, ptr};
-use syntax::ast::{self, Ident, Name, NodeId};
+use syntax::ast::{self, Constness, Ident, Name, NodeId};
use syntax::attr;
pub use self::sty::BoundRegion::*;
@@ -1068,7 +1068,11 @@
/// Corresponds to `where Foo: Bar<A, B, C>`. `Foo` here would be
/// the `Self` type of the trait reference and `A`, `B`, and `C`
/// would be the type parameters.
- Trait(PolyTraitPredicate<'tcx>),
+ ///
+ /// A trait predicate will have `Constness::Const` if it originates
+ /// from a bound on a `const fn` without the `?const` opt-out (e.g.,
+ /// `const fn foobar<Foo: Bar>() {}`).
+ Trait(PolyTraitPredicate<'tcx>, Constness),
/// `where 'a: 'b`
RegionOutlives(PolyRegionOutlivesPredicate<'tcx>),
@@ -1191,8 +1195,8 @@
let substs = &trait_ref.skip_binder().substs;
match *self {
- Predicate::Trait(ref binder) => {
- Predicate::Trait(binder.map_bound(|data| data.subst(tcx, substs)))
+ Predicate::Trait(ref binder, constness) => {
+ Predicate::Trait(binder.map_bound(|data| data.subst(tcx, substs)), constness)
}
Predicate::Subtype(ref binder) => {
Predicate::Subtype(binder.map_bound(|data| data.subst(tcx, substs)))
@@ -1336,15 +1340,33 @@
fn to_predicate(&self) -> Predicate<'tcx>;
}
-impl<'tcx> ToPredicate<'tcx> for TraitRef<'tcx> {
+impl<'tcx> ToPredicate<'tcx> for ConstnessAnd<TraitRef<'tcx>> {
fn to_predicate(&self) -> Predicate<'tcx> {
- ty::Predicate::Trait(ty::Binder::dummy(ty::TraitPredicate { trait_ref: self.clone() }))
+ ty::Predicate::Trait(
+ ty::Binder::dummy(ty::TraitPredicate { trait_ref: self.value.clone() }),
+ self.constness,
+ )
}
}
-impl<'tcx> ToPredicate<'tcx> for PolyTraitRef<'tcx> {
+impl<'tcx> ToPredicate<'tcx> for ConstnessAnd<&TraitRef<'tcx>> {
fn to_predicate(&self) -> Predicate<'tcx> {
- ty::Predicate::Trait(self.to_poly_trait_predicate())
+ ty::Predicate::Trait(
+ ty::Binder::dummy(ty::TraitPredicate { trait_ref: self.value.clone() }),
+ self.constness,
+ )
+ }
+}
+
+impl<'tcx> ToPredicate<'tcx> for ConstnessAnd<PolyTraitRef<'tcx>> {
+ fn to_predicate(&self) -> Predicate<'tcx> {
+ ty::Predicate::Trait(self.value.to_poly_trait_predicate(), self.constness)
+ }
+}
+
+impl<'tcx> ToPredicate<'tcx> for ConstnessAnd<&PolyTraitRef<'tcx>> {
+ fn to_predicate(&self) -> Predicate<'tcx> {
+ ty::Predicate::Trait(self.value.to_poly_trait_predicate(), self.constness)
}
}
@@ -1413,7 +1435,7 @@
/// with depth 0 are bound by the predicate.
pub fn walk_tys(&'a self) -> impl Iterator<Item = Ty<'tcx>> + 'a {
match *self {
- ty::Predicate::Trait(ref data) => {
+ ty::Predicate::Trait(ref data, _) => {
WalkTysIter::InputTypes(data.skip_binder().input_types())
}
ty::Predicate::Subtype(binder) => {
@@ -1439,7 +1461,7 @@
pub fn to_opt_poly_trait_ref(&self) -> Option<PolyTraitRef<'tcx>> {
match *self {
- Predicate::Trait(ref t) => Some(t.to_poly_trait_ref()),
+ Predicate::Trait(ref t, _) => Some(t.to_poly_trait_ref()),
Predicate::Projection(..)
| Predicate::Subtype(..)
| Predicate::RegionOutlives(..)
@@ -1700,6 +1722,33 @@
}
}
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+pub struct ConstnessAnd<T> {
+ pub constness: Constness,
+ pub value: T,
+}
+
+// FIXME(ecstaticmorse): Audit all occurrences of `without_const().to_predicate()` to ensure that
+// the constness of trait bounds is being propagated correctly.
+pub trait WithConstness: Sized {
+ #[inline]
+ fn with_constness(self, constness: Constness) -> ConstnessAnd<Self> {
+ ConstnessAnd { constness, value: self }
+ }
+
+ #[inline]
+ fn with_const(self) -> ConstnessAnd<Self> {
+ self.with_constness(Constness::Const)
+ }
+
+ #[inline]
+ fn without_const(self) -> ConstnessAnd<Self> {
+ self.with_constness(Constness::NotConst)
+ }
+}
+
+impl<T> WithConstness for T {}
+
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, TypeFoldable)]
pub struct ParamEnvAnd<'tcx, T> {
pub param_env: ParamEnv<'tcx>,
diff --git a/src/librustc/ty/print/pretty.rs b/src/librustc/ty/print/pretty.rs
index 8b1b2bb..9091de5 100644
--- a/src/librustc/ty/print/pretty.rs
+++ b/src/librustc/ty/print/pretty.rs
@@ -1791,7 +1791,12 @@
ty::Predicate<'tcx> {
match *self {
- ty::Predicate::Trait(ref data) => p!(print(data)),
+ ty::Predicate::Trait(ref data, constness) => {
+ if let ast::Constness::Const = constness {
+ p!(write("const "));
+ }
+ p!(print(data))
+ }
ty::Predicate::Subtype(ref predicate) => p!(print(predicate)),
ty::Predicate::RegionOutlives(ref predicate) => p!(print(predicate)),
ty::Predicate::TypeOutlives(ref predicate) => p!(print(predicate)),
diff --git a/src/librustc/ty/structural_impls.rs b/src/librustc/ty/structural_impls.rs
index 62e895a..25f9dc5 100644
--- a/src/librustc/ty/structural_impls.rs
+++ b/src/librustc/ty/structural_impls.rs
@@ -15,6 +15,7 @@
use std::fmt;
use std::rc::Rc;
use std::sync::Arc;
+use syntax::ast;
impl fmt::Debug for ty::GenericParamDef {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
@@ -234,7 +235,12 @@
impl fmt::Debug for ty::Predicate<'tcx> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
- ty::Predicate::Trait(ref a) => a.fmt(f),
+ ty::Predicate::Trait(ref a, constness) => {
+ if let ast::Constness::Const = constness {
+ write!(f, "const ")?;
+ }
+ a.fmt(f)
+ }
ty::Predicate::Subtype(ref pair) => pair.fmt(f),
ty::Predicate::RegionOutlives(ref pair) => pair.fmt(f),
ty::Predicate::TypeOutlives(ref pair) => pair.fmt(f),
@@ -474,7 +480,9 @@
type Lifted = ty::Predicate<'tcx>;
fn lift_to_tcx(&self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
match *self {
- ty::Predicate::Trait(ref binder) => tcx.lift(binder).map(ty::Predicate::Trait),
+ ty::Predicate::Trait(ref binder, constness) => {
+ tcx.lift(binder).map(|binder| ty::Predicate::Trait(binder, constness))
+ }
ty::Predicate::Subtype(ref binder) => tcx.lift(binder).map(ty::Predicate::Subtype),
ty::Predicate::RegionOutlives(ref binder) => {
tcx.lift(binder).map(ty::Predicate::RegionOutlives)
diff --git a/src/librustc/ty/sty.rs b/src/librustc/ty/sty.rs
index 8423612..13f623a 100644
--- a/src/librustc/ty/sty.rs
+++ b/src/librustc/ty/sty.rs
@@ -12,7 +12,9 @@
use crate::mir::Promoted;
use crate::ty::layout::VariantIdx;
use crate::ty::subst::{GenericArg, GenericArgKind, InternalSubsts, Subst, SubstsRef};
-use crate::ty::{self, AdtDef, DefIdTree, Discr, Ty, TyCtxt, TypeFlags, TypeFoldable};
+use crate::ty::{
+ self, AdtDef, DefIdTree, Discr, Ty, TyCtxt, TypeFlags, TypeFoldable, WithConstness,
+};
use crate::ty::{List, ParamEnv, ParamEnvAnd, TyS};
use polonius_engine::Atom;
use rustc_data_structures::captures::Captures;
@@ -665,14 +667,16 @@
pub fn with_self_ty(&self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> ty::Predicate<'tcx> {
use crate::ty::ToPredicate;
match *self.skip_binder() {
- ExistentialPredicate::Trait(tr) => Binder(tr).with_self_ty(tcx, self_ty).to_predicate(),
+ ExistentialPredicate::Trait(tr) => {
+ Binder(tr).with_self_ty(tcx, self_ty).without_const().to_predicate()
+ }
ExistentialPredicate::Projection(p) => {
ty::Predicate::Projection(Binder(p.with_self_ty(tcx, self_ty)))
}
ExistentialPredicate::AutoTrait(did) => {
let trait_ref =
Binder(ty::TraitRef { def_id: did, substs: tcx.mk_substs_trait(self_ty, &[]) });
- trait_ref.to_predicate()
+ trait_ref.without_const().to_predicate()
}
}
}
diff --git a/src/librustc_ast_lowering/expr.rs b/src/librustc_ast_lowering/expr.rs
index a24bb52..5dc855e 100644
--- a/src/librustc_ast_lowering/expr.rs
+++ b/src/librustc_ast_lowering/expr.rs
@@ -848,10 +848,7 @@
}
}
- fn with_catch_scope<T, F>(&mut self, catch_id: NodeId, f: F) -> T
- where
- F: FnOnce(&mut Self) -> T,
- {
+ fn with_catch_scope<T>(&mut self, catch_id: NodeId, f: impl FnOnce(&mut Self) -> T) -> T {
let len = self.catch_scopes.len();
self.catch_scopes.push(catch_id);
@@ -867,10 +864,7 @@
result
}
- fn with_loop_scope<T, F>(&mut self, loop_id: NodeId, f: F) -> T
- where
- F: FnOnce(&mut Self) -> T,
- {
+ fn with_loop_scope<T>(&mut self, loop_id: NodeId, f: impl FnOnce(&mut Self) -> T) -> T {
// We're no longer in the base loop's condition; we're in another loop.
let was_in_loop_condition = self.is_in_loop_condition;
self.is_in_loop_condition = false;
@@ -892,10 +886,7 @@
result
}
- fn with_loop_condition_scope<T, F>(&mut self, f: F) -> T
- where
- F: FnOnce(&mut Self) -> T,
- {
+ fn with_loop_condition_scope<T>(&mut self, f: impl FnOnce(&mut Self) -> T) -> T {
let was_in_loop_condition = self.is_in_loop_condition;
self.is_in_loop_condition = true;
diff --git a/src/librustc_ast_lowering/item.rs b/src/librustc_ast_lowering/item.rs
index bcc40b0..2025d0c 100644
--- a/src/librustc_ast_lowering/item.rs
+++ b/src/librustc_ast_lowering/item.rs
@@ -66,9 +66,8 @@
if let Some(hir_id) = item_hir_id {
self.lctx.with_parent_item_lifetime_defs(hir_id, |this| {
let this = &mut ItemLowerer { lctx: this };
- if let ItemKind::Impl { ref of_trait, .. } = item.kind {
- if of_trait.as_ref().map(|tr| tr.constness.is_some()).unwrap_or(false) {
- this.with_trait_impl_ref(of_trait, |this| visit::walk_item(this, item));
+ if let ItemKind::Impl { constness, ref of_trait, .. } = item.kind {
+ if constness == Constness::Const {
this.lctx
.diagnostic()
.span_err(item.span, "const trait impls are not yet implemented");
@@ -365,6 +364,7 @@
unsafety,
polarity,
defaultness,
+ constness,
generics: ref ast_generics,
of_trait: ref trait_ref,
self_ty: ref ty,
@@ -421,6 +421,7 @@
unsafety,
polarity,
defaultness: self.lower_defaultness(defaultness, true /* [1] */),
+ constness,
generics,
of_trait: trait_ref,
self_ty: lowered_ty,
diff --git a/src/librustc_ast_lowering/lib.rs b/src/librustc_ast_lowering/lib.rs
index 2cd4a6e..284ede3 100644
--- a/src/librustc_ast_lowering/lib.rs
+++ b/src/librustc_ast_lowering/lib.rs
@@ -1249,10 +1249,16 @@
let bounds =
this.arena.alloc_from_iter(bounds.iter().filter_map(
|bound| match *bound {
- GenericBound::Trait(ref ty, TraitBoundModifier::None) => {
+ GenericBound::Trait(ref ty, TraitBoundModifier::None)
+ | GenericBound::Trait(ref ty, TraitBoundModifier::MaybeConst) => {
Some(this.lower_poly_trait_ref(ty, itctx.reborrow()))
}
- GenericBound::Trait(_, TraitBoundModifier::Maybe) => None,
+ // `?const ?Bound` will cause an error during AST validation
+ // anyways, so treat it like `?Bound` as compilation proceeds.
+ GenericBound::Trait(_, TraitBoundModifier::Maybe)
+ | GenericBound::Trait(_, TraitBoundModifier::MaybeConstMaybe) => {
+ None
+ }
GenericBound::Outlives(ref lifetime) => {
if lifetime_bound.is_none() {
lifetime_bound = Some(this.lower_lifetime(lifetime));
@@ -2157,10 +2163,6 @@
p: &PolyTraitRef,
mut itctx: ImplTraitContext<'_, 'hir>,
) -> hir::PolyTraitRef<'hir> {
- if p.trait_ref.constness.is_some() {
- self.diagnostic().span_err(p.span, "`?const` on trait bounds is not yet implemented");
- }
-
let bound_generic_params = self.lower_generic_params(
&p.bound_generic_params,
&NodeMap::default(),
@@ -2299,7 +2301,13 @@
fn lower_trait_bound_modifier(&mut self, f: TraitBoundModifier) -> hir::TraitBoundModifier {
match f {
TraitBoundModifier::None => hir::TraitBoundModifier::None,
- TraitBoundModifier::Maybe => hir::TraitBoundModifier::Maybe,
+ TraitBoundModifier::MaybeConst => hir::TraitBoundModifier::MaybeConst,
+
+ // `MaybeConstMaybe` will cause an error during AST validation, but we need to pick a
+ // placeholder for compilation to proceed.
+ TraitBoundModifier::MaybeConstMaybe | TraitBoundModifier::Maybe => {
+ hir::TraitBoundModifier::Maybe
+ }
}
}
diff --git a/src/librustc_ast_passes/ast_validation.rs b/src/librustc_ast_passes/ast_validation.rs
index bc02406..152086b 100644
--- a/src/librustc_ast_passes/ast_validation.rs
+++ b/src/librustc_ast_passes/ast_validation.rs
@@ -614,6 +614,7 @@
unsafety,
polarity,
defaultness: _,
+ constness: _,
generics: _,
of_trait: Some(_),
ref self_ty,
@@ -647,6 +648,7 @@
unsafety,
polarity,
defaultness,
+ constness,
generics: _,
of_trait: None,
self_ty: _,
@@ -674,6 +676,12 @@
.note("only trait implementations may be annotated with default")
.emit();
}
+ if constness == Constness::Const {
+ self.err_handler()
+ .struct_span_err(item.span, "inherent impls cannot be `const`")
+ .note("only trait implementations may be annotated with `const`")
+ .emit();
+ }
}
ItemKind::Fn(ref sig, ref generics, _) => {
self.visit_fn_header(&sig.header);
@@ -907,23 +915,20 @@
}
fn visit_param_bound(&mut self, bound: &'a GenericBound) {
- if let GenericBound::Trait(poly, maybe_bound) = bound {
- match poly.trait_ref.constness {
- Some(Constness::NotConst) => {
- if *maybe_bound == TraitBoundModifier::Maybe {
- self.err_handler()
- .span_err(bound.span(), "`?const` and `?` are mutually exclusive");
- }
-
- if let Some(ctx) = self.bound_context {
- let msg = format!("`?const` is not permitted in {}", ctx.description());
- self.err_handler().span_err(bound.span(), &msg);
- }
+ match bound {
+ GenericBound::Trait(_, TraitBoundModifier::MaybeConst) => {
+ if let Some(ctx) = self.bound_context {
+ let msg = format!("`?const` is not permitted in {}", ctx.description());
+ self.err_handler().span_err(bound.span(), &msg);
}
-
- Some(Constness::Const) => panic!("Parser should reject bare `const` on bounds"),
- None => {}
}
+
+ GenericBound::Trait(_, TraitBoundModifier::MaybeConstMaybe) => {
+ self.err_handler()
+ .span_err(bound.span(), "`?const` and `?` are mutually exclusive");
+ }
+
+ _ => {}
}
visit::walk_param_bound(self, bound)
diff --git a/src/librustc_builtin_macros/deriving/generic/mod.rs b/src/librustc_builtin_macros/deriving/generic/mod.rs
index d346dbc8..f891801 100644
--- a/src/librustc_builtin_macros/deriving/generic/mod.rs
+++ b/src/librustc_builtin_macros/deriving/generic/mod.rs
@@ -709,6 +709,7 @@
unsafety,
polarity: ast::ImplPolarity::Positive,
defaultness: ast::Defaultness::Final,
+ constness: ast::Constness::NotConst,
generics: trait_generics,
of_trait: opt_trait_ref,
self_ty: self_type,
diff --git a/src/librustc_builtin_macros/deriving/mod.rs b/src/librustc_builtin_macros/deriving/mod.rs
index 9aa7623..914dcdf 100644
--- a/src/librustc_builtin_macros/deriving/mod.rs
+++ b/src/librustc_builtin_macros/deriving/mod.rs
@@ -160,6 +160,7 @@
unsafety: ast::Unsafety::Normal,
polarity: ast::ImplPolarity::Positive,
defaultness: ast::Defaultness::Final,
+ constness: ast::Constness::NotConst,
generics,
of_trait: Some(trait_ref),
self_ty: self_type,
diff --git a/src/librustc_codegen_llvm/llvm_util.rs b/src/librustc_codegen_llvm/llvm_util.rs
index 52613fe..4823fe1 100644
--- a/src/librustc_codegen_llvm/llvm_util.rs
+++ b/src/librustc_codegen_llvm/llvm_util.rs
@@ -58,9 +58,10 @@
let cg_opts = sess.opts.cg.llvm_args.iter();
let tg_opts = sess.target.target.options.llvm_args.iter();
+ let sess_args = cg_opts.chain(tg_opts);
let user_specified_args: FxHashSet<_> =
- cg_opts.chain(tg_opts).map(|s| llvm_arg_to_arg_name(s)).filter(|s| s.len() > 0).collect();
+ sess_args.clone().map(|s| llvm_arg_to_arg_name(s)).filter(|s| s.len() > 0).collect();
{
// This adds the given argument to LLVM. Unless `force` is true
@@ -107,7 +108,7 @@
// during inlining. Unfortunately these may block other optimizations.
add("-preserve-alignment-assumptions-during-inlining=false", false);
- for arg in &sess.opts.cg.llvm_args {
+ for arg in sess_args {
add(&(*arg), true);
}
}
diff --git a/src/librustc_expand/build.rs b/src/librustc_expand/build.rs
index bd3d6b5..11f94ab 100644
--- a/src/librustc_expand/build.rs
+++ b/src/librustc_expand/build.rs
@@ -110,7 +110,7 @@
}
pub fn trait_ref(&self, path: ast::Path) -> ast::TraitRef {
- ast::TraitRef { path, constness: None, ref_id: ast::DUMMY_NODE_ID }
+ ast::TraitRef { path, ref_id: ast::DUMMY_NODE_ID }
}
pub fn poly_trait_ref(&self, span: Span, path: ast::Path) -> ast::PolyTraitRef {
diff --git a/src/librustc_hir/hir.rs b/src/librustc_hir/hir.rs
index 1fef871b..b62a7e4 100644
--- a/src/librustc_hir/hir.rs
+++ b/src/librustc_hir/hir.rs
@@ -364,6 +364,7 @@
pub enum TraitBoundModifier {
None,
Maybe,
+ MaybeConst,
}
/// The AST represents all type param bounds as types.
@@ -2440,6 +2441,7 @@
unsafety: Unsafety,
polarity: ImplPolarity,
defaultness: Defaultness,
+ constness: Constness,
generics: Generics<'hir>,
/// The trait being implemented, if any.
diff --git a/src/librustc_hir/intravisit.rs b/src/librustc_hir/intravisit.rs
index 1a73e41..539a0ee 100644
--- a/src/librustc_hir/intravisit.rs
+++ b/src/librustc_hir/intravisit.rs
@@ -570,6 +570,7 @@
unsafety: _,
defaultness: _,
polarity: _,
+ constness: _,
ref generics,
ref of_trait,
ref self_ty,
diff --git a/src/librustc_hir/print.rs b/src/librustc_hir/print.rs
index 6c7d419..b9598c9 100644
--- a/src/librustc_hir/print.rs
+++ b/src/librustc_hir/print.rs
@@ -631,6 +631,7 @@
unsafety,
polarity,
defaultness,
+ constness,
ref generics,
ref of_trait,
ref self_ty,
@@ -647,6 +648,10 @@
self.s.space();
}
+ if constness == ast::Constness::Const {
+ self.word_nbsp("const");
+ }
+
if let hir::ImplPolarity::Negative = polarity {
self.s.word("!");
}
diff --git a/src/librustc_lint/unused.rs b/src/librustc_lint/unused.rs
index 26cbda3..15158c0 100644
--- a/src/librustc_lint/unused.rs
+++ b/src/librustc_lint/unused.rs
@@ -144,7 +144,7 @@
ty::Opaque(def, _) => {
let mut has_emitted = false;
for (predicate, _) in cx.tcx.predicates_of(def).predicates {
- if let ty::Predicate::Trait(ref poly_trait_predicate) = predicate {
+ if let ty::Predicate::Trait(ref poly_trait_predicate, _) = predicate {
let trait_ref = poly_trait_predicate.skip_binder().trait_ref;
let def_id = trait_ref.def_id;
let descr_pre =
diff --git a/src/librustc_mir/borrow_check/type_check/mod.rs b/src/librustc_mir/borrow_check/type_check/mod.rs
index a92abc9..c9a1c46 100644
--- a/src/librustc_mir/borrow_check/type_check/mod.rs
+++ b/src/librustc_mir/borrow_check/type_check/mod.rs
@@ -32,6 +32,7 @@
use rustc_hir::def_id::DefId;
use rustc_index::vec::{Idx, IndexVec};
use rustc_span::{Span, DUMMY_SP};
+use syntax::ast;
use crate::dataflow::move_paths::MoveData;
use crate::dataflow::FlowAtLocation;
@@ -1930,12 +1931,15 @@
traits::ObligationCauseCode::RepeatVec(should_suggest),
),
self.param_env,
- ty::Predicate::Trait(ty::Binder::bind(ty::TraitPredicate {
- trait_ref: ty::TraitRef::new(
- self.tcx().lang_items().copy_trait().unwrap(),
- tcx.mk_substs_trait(ty, &[]),
- ),
- })),
+ ty::Predicate::Trait(
+ ty::Binder::bind(ty::TraitPredicate {
+ trait_ref: ty::TraitRef::new(
+ self.tcx().lang_items().copy_trait().unwrap(),
+ tcx.mk_substs_trait(ty, &[]),
+ ),
+ }),
+ ast::Constness::NotConst,
+ ),
),
&traits::SelectionError::Unimplemented,
false,
@@ -2573,7 +2577,10 @@
category: ConstraintCategory,
) {
self.prove_predicates(
- Some(ty::Predicate::Trait(trait_ref.to_poly_trait_ref().to_poly_trait_predicate())),
+ Some(ty::Predicate::Trait(
+ trait_ref.to_poly_trait_ref().to_poly_trait_predicate(),
+ ast::Constness::NotConst,
+ )),
locations,
category,
);
diff --git a/src/librustc_mir/transform/qualify_min_const_fn.rs b/src/librustc_mir/transform/qualify_min_const_fn.rs
index d927553..b047e53 100644
--- a/src/librustc_mir/transform/qualify_min_const_fn.rs
+++ b/src/librustc_mir/transform/qualify_min_const_fn.rs
@@ -5,7 +5,7 @@
use rustc_span::symbol::{sym, Symbol};
use rustc_span::Span;
use std::borrow::Cow;
-use syntax::attr;
+use syntax::{ast, attr};
type McfResult = Result<(), (Span, Cow<'static, str>)>;
@@ -27,12 +27,19 @@
bug!("closure kind predicate on function: {:#?}", predicate)
}
Predicate::Subtype(_) => bug!("subtype predicate on function: {:#?}", predicate),
- Predicate::Trait(pred) => {
+ Predicate::Trait(pred, constness) => {
if Some(pred.def_id()) == tcx.lang_items().sized_trait() {
continue;
}
match pred.skip_binder().self_ty().kind {
ty::Param(ref p) => {
+ // Allow `T: ?const Trait`
+ if *constness == ast::Constness::NotConst
+ && feature_allowed(tcx, def_id, sym::const_trait_bound_opt_out)
+ {
+ continue;
+ }
+
let generics = tcx.generics_of(current);
let def = generics.type_param(p, tcx);
let span = tcx.def_span(def.def_id);
diff --git a/src/librustc_mir_build/Cargo.toml b/src/librustc_mir_build/Cargo.toml
index f0d1d4c..a22c4d1 100644
--- a/src/librustc_mir_build/Cargo.toml
+++ b/src/librustc_mir_build/Cargo.toml
@@ -21,6 +21,7 @@
rustc_hir = { path = "../librustc_hir" }
rustc_macros = { path = "../librustc_macros" }
rustc_serialize = { path = "../libserialize", package = "serialize" }
+rustc_session = { path = "../librustc_session" }
rustc_span = { path = "../librustc_span" }
rustc_target = { path = "../librustc_target" }
syntax = { path = "../libsyntax" }
diff --git a/src/librustc_mir_build/hair/pattern/_match.rs b/src/librustc_mir_build/hair/pattern/_match.rs
index 8fcaa1e..20183fd 100644
--- a/src/librustc_mir_build/hair/pattern/_match.rs
+++ b/src/librustc_mir_build/hair/pattern/_match.rs
@@ -582,15 +582,12 @@
}
impl<'a, 'tcx> MatchCheckCtxt<'a, 'tcx> {
- crate fn create_and_enter<F, R>(
+ crate fn create_and_enter<R>(
tcx: TyCtxt<'tcx>,
param_env: ty::ParamEnv<'tcx>,
module: DefId,
- f: F,
- ) -> R
- where
- F: for<'b> FnOnce(MatchCheckCtxt<'b, 'tcx>) -> R,
- {
+ f: impl for<'b> FnOnce(MatchCheckCtxt<'b, 'tcx>) -> R,
+ ) -> R {
let pattern_arena = TypedArena::default();
f(MatchCheckCtxt { tcx, param_env, module, pattern_arena: &pattern_arena })
diff --git a/src/librustc_mir_build/hair/pattern/check_match.rs b/src/librustc_mir_build/hair/pattern/check_match.rs
index eac52da..49b7c2d 100644
--- a/src/librustc_mir_build/hair/pattern/check_match.rs
+++ b/src/librustc_mir_build/hair/pattern/check_match.rs
@@ -5,9 +5,6 @@
use super::{PatCtxt, PatKind, PatternError};
use rustc::hir::map::Map;
-use rustc::lint;
-use rustc::session::parse::feature_err;
-use rustc::session::Session;
use rustc::ty::{self, Ty, TyCtxt};
use rustc_errors::{error_code, struct_span_err, Applicability, DiagnosticBuilder};
use rustc_hir as hir;
@@ -15,6 +12,10 @@
use rustc_hir::def_id::DefId;
use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
use rustc_hir::{HirId, Pat};
+use rustc_session::lint::builtin::BINDINGS_WITH_VARIANT_NAME;
+use rustc_session::lint::builtin::{IRREFUTABLE_LET_PATTERNS, UNREACHABLE_PATTERNS};
+use rustc_session::parse::feature_err;
+use rustc_session::Session;
use rustc_span::symbol::sym;
use rustc_span::{MultiSpan, Span};
use syntax::ast::Mutability;
@@ -67,18 +68,13 @@
hir::LocalSource::AwaitDesugar => ("`await` future binding", None),
};
self.check_irrefutable(&loc.pat, msg, sp);
-
- // Check legality of move bindings and `@` patterns.
self.check_patterns(false, &loc.pat);
}
- fn visit_body(&mut self, body: &'tcx hir::Body<'tcx>) {
- intravisit::walk_body(self, body);
-
- for param in body.params {
- self.check_irrefutable(¶m.pat, "function argument", None);
- self.check_patterns(false, ¶m.pat);
- }
+ fn visit_param(&mut self, param: &'tcx hir::Param<'tcx>) {
+ intravisit::walk_param(self, param);
+ self.check_irrefutable(¶m.pat, "function argument", None);
+ self.check_patterns(false, ¶m.pat);
}
}
@@ -123,6 +119,25 @@
if !self.tcx.features().bindings_after_at {
check_legality_of_bindings_in_at_patterns(self, pat);
}
+ check_for_bindings_named_same_as_variants(self, pat);
+ }
+
+ fn lower_pattern<'p>(
+ &self,
+ cx: &mut MatchCheckCtxt<'p, 'tcx>,
+ pat: &'tcx hir::Pat<'tcx>,
+ have_errors: &mut bool,
+ ) -> (&'p super::Pat<'tcx>, Ty<'tcx>) {
+ let mut patcx = PatCtxt::new(self.tcx, self.param_env, self.tables);
+ patcx.include_lint_checks();
+ let pattern = patcx.lower_pattern(pat);
+ let pattern_ty = pattern.ty;
+ let pattern: &_ = cx.pattern_arena.alloc(expand_pattern(cx, pattern));
+ if !patcx.errors.is_empty() {
+ *have_errors = true;
+ patcx.report_inlining_errors(pat.span);
+ }
+ (pattern, pattern_ty)
}
fn check_match(
@@ -132,11 +147,8 @@
source: hir::MatchSource,
) {
for arm in arms {
- // First, check legality of move bindings.
+ // Check the arm for some things unrelated to exhaustiveness.
self.check_patterns(arm.guard.is_some(), &arm.pat);
-
- // Second, perform some lints.
- check_for_bindings_named_same_as_variants(self, &arm.pat);
}
let module = self.tcx.hir().get_module_parent(scrut.hir_id);
@@ -145,16 +157,8 @@
let inlined_arms: Vec<_> = arms
.iter()
- .map(|arm| {
- let mut patcx = PatCtxt::new(self.tcx, self.param_env, self.tables);
- patcx.include_lint_checks();
- let pattern = patcx.lower_pattern(&arm.pat);
- let pattern: &_ = cx.pattern_arena.alloc(expand_pattern(cx, pattern));
- if !patcx.errors.is_empty() {
- patcx.report_inlining_errors(arm.pat.span);
- have_errors = true;
- }
- (pattern, &*arm.pat, arm.guard.is_some())
+ .map(|hir::Arm { pat, guard, .. }| {
+ (self.lower_pattern(cx, pat, &mut have_errors).0, pat.hir_id, guard.is_some())
})
.collect();
@@ -178,11 +182,7 @@
fn check_irrefutable(&self, pat: &'tcx Pat<'tcx>, origin: &str, sp: Option<Span>) {
let module = self.tcx.hir().get_module_parent(pat.hir_id);
MatchCheckCtxt::create_and_enter(self.tcx, self.param_env, module, |ref mut cx| {
- let mut patcx = PatCtxt::new(self.tcx, self.param_env, self.tables);
- patcx.include_lint_checks();
- let pattern = patcx.lower_pattern(pat);
- let pattern_ty = pattern.ty;
- let pattern = cx.pattern_arena.alloc(expand_pattern(cx, pattern));
+ let (pattern, pattern_ty) = self.lower_pattern(cx, pat, &mut false);
let pats: Matrix<'_, '_> = vec![PatStack::from_pattern(pattern)].into_iter().collect();
let witnesses = match check_not_useful(cx, pattern_ty, &pats, pat.hir_id) {
@@ -285,7 +285,7 @@
let ty_path = cx.tcx.def_path_str(edef.did);
cx.tcx
.struct_span_lint_hir(
- lint::builtin::BINDINGS_WITH_VARIANT_NAME,
+ BINDINGS_WITH_VARIANT_NAME,
p.hir_id,
p.span,
&format!(
@@ -310,79 +310,63 @@
}
/// Checks for common cases of "catchall" patterns that may not be intended as such.
-fn pat_is_catchall(pat: &Pat<'_>) -> bool {
- match pat.kind {
- hir::PatKind::Binding(.., None) => true,
- hir::PatKind::Binding(.., Some(ref s)) => pat_is_catchall(s),
- hir::PatKind::Ref(ref s, _) => pat_is_catchall(s),
- hir::PatKind::Tuple(ref v, _) => v.iter().all(|p| pat_is_catchall(&p)),
+fn pat_is_catchall(pat: &super::Pat<'_>) -> bool {
+ use super::PatKind::*;
+ match &*pat.kind {
+ Binding { subpattern: None, .. } => true,
+ Binding { subpattern: Some(s), .. } | Deref { subpattern: s } => pat_is_catchall(s),
+ Leaf { subpatterns: s } => s.iter().all(|p| pat_is_catchall(&p.pattern)),
_ => false,
}
}
+fn unreachable_pattern(tcx: TyCtxt<'_>, span: Span, id: HirId, catchall: Option<Span>) {
+ let mut err = tcx.struct_span_lint_hir(UNREACHABLE_PATTERNS, id, span, "unreachable pattern");
+ if let Some(catchall) = catchall {
+ // We had a catchall pattern, hint at that.
+ err.span_label(span, "unreachable pattern");
+ err.span_label(catchall, "matches any value");
+ }
+ err.emit();
+}
+
+fn irrefutable_let_pattern(tcx: TyCtxt<'_>, span: Span, id: HirId, source: hir::MatchSource) {
+ let msg = match source {
+ hir::MatchSource::IfLetDesugar { .. } => "irrefutable if-let pattern",
+ hir::MatchSource::WhileLetDesugar => "irrefutable while-let pattern",
+ _ => bug!(),
+ };
+ tcx.lint_hir(IRREFUTABLE_LET_PATTERNS, id, span, msg);
+}
+
/// Check for unreachable patterns.
fn check_arms<'p, 'tcx>(
cx: &mut MatchCheckCtxt<'p, 'tcx>,
- arms: &[(&'p super::Pat<'tcx>, &hir::Pat<'_>, bool)],
+ arms: &[(&'p super::Pat<'tcx>, HirId, bool)],
source: hir::MatchSource,
) -> Matrix<'p, 'tcx> {
let mut seen = Matrix::empty();
let mut catchall = None;
- for (arm_index, (pat, hir_pat, has_guard)) in arms.iter().enumerate() {
+ for (arm_index, (pat, id, has_guard)) in arms.iter().copied().enumerate() {
let v = PatStack::from_pattern(pat);
-
- match is_useful(cx, &seen, &v, LeaveOutWitness, hir_pat.hir_id, true) {
+ match is_useful(cx, &seen, &v, LeaveOutWitness, id, true) {
NotUseful => {
match source {
hir::MatchSource::IfDesugar { .. } | hir::MatchSource::WhileDesugar => bug!(),
hir::MatchSource::IfLetDesugar { .. } | hir::MatchSource::WhileLetDesugar => {
- // check which arm we're on.
+ // Check which arm we're on.
match arm_index {
// The arm with the user-specified pattern.
- 0 => {
- cx.tcx.lint_hir(
- lint::builtin::UNREACHABLE_PATTERNS,
- hir_pat.hir_id,
- pat.span,
- "unreachable pattern",
- );
- }
+ 0 => unreachable_pattern(cx.tcx, pat.span, id, None),
// The arm with the wildcard pattern.
- 1 => {
- let msg = match source {
- hir::MatchSource::IfLetDesugar { .. } => {
- "irrefutable if-let pattern"
- }
- hir::MatchSource::WhileLetDesugar => {
- "irrefutable while-let pattern"
- }
- _ => bug!(),
- };
- cx.tcx.lint_hir(
- lint::builtin::IRREFUTABLE_LET_PATTERNS,
- hir_pat.hir_id,
- pat.span,
- msg,
- );
- }
+ 1 => irrefutable_let_pattern(cx.tcx, pat.span, id, source),
_ => bug!(),
}
}
hir::MatchSource::ForLoopDesugar | hir::MatchSource::Normal => {
- let mut err = cx.tcx.struct_span_lint_hir(
- lint::builtin::UNREACHABLE_PATTERNS,
- hir_pat.hir_id,
- pat.span,
- "unreachable pattern",
- );
- // if we had a catchall pattern, hint at that
- if let Some(catchall) = catchall {
- err.span_label(pat.span, "unreachable pattern");
- err.span_label(catchall, "matches any value");
- }
- err.emit();
+ unreachable_pattern(cx.tcx, pat.span, id, catchall);
}
// Unreachable patterns in try and await expressions occur when one of
@@ -392,19 +376,14 @@
}
Useful(unreachable_subpatterns) => {
for pat in unreachable_subpatterns {
- cx.tcx.lint_hir(
- lint::builtin::UNREACHABLE_PATTERNS,
- hir_pat.hir_id,
- pat.span,
- "unreachable pattern",
- );
+ unreachable_pattern(cx.tcx, pat.span, id, None);
}
}
UsefulWithWitness(_) => bug!(),
}
if !has_guard {
seen.push(v);
- if catchall.is_none() && pat_is_catchall(hir_pat) {
+ if catchall.is_none() && pat_is_catchall(pat) {
catchall = Some(pat.span);
}
}
diff --git a/src/librustc_parse/parser/item.rs b/src/librustc_parse/parser/item.rs
index 5076aaf..31db7fc 100644
--- a/src/librustc_parse/parser/item.rs
+++ b/src/librustc_parse/parser/item.rs
@@ -4,7 +4,7 @@
use crate::maybe_whole;
use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder, PResult, StashKey};
-use rustc_span::source_map::{self, respan, Span, Spanned};
+use rustc_span::source_map::{self, respan, Span};
use rustc_span::symbol::{kw, sym, Symbol};
use rustc_span::BytePos;
use syntax::ast::{self, AttrKind, AttrStyle, AttrVec, Attribute, Ident, DUMMY_NODE_ID};
@@ -565,9 +565,9 @@
let constness = if self.eat_keyword(kw::Const) {
let span = self.prev_span;
self.sess.gated_spans.gate(sym::const_trait_impl, span);
- Some(respan(span, Constness::Const))
+ Constness::Const
} else {
- None
+ Constness::NotConst
};
// Disambiguate `impl !Trait for Type { ... }` and `impl ! { ... }` for the never type.
@@ -630,13 +630,13 @@
err_path(ty_first.span)
}
};
- let constness = constness.map(|c| c.node);
- let trait_ref = TraitRef { path, constness, ref_id: ty_first.id };
+ let trait_ref = TraitRef { path, ref_id: ty_first.id };
ItemKind::Impl {
unsafety,
polarity,
defaultness,
+ constness,
generics,
of_trait: Some(trait_ref),
self_ty: ty_second,
@@ -644,18 +644,12 @@
}
}
None => {
- // Reject `impl const Type {}` here
- if let Some(Spanned { node: Constness::Const, span }) = constness {
- self.struct_span_err(span, "`const` cannot modify an inherent impl")
- .help("only a trait impl can be `const`")
- .emit();
- }
-
// impl Type
ItemKind::Impl {
unsafety,
polarity,
defaultness,
+ constness,
generics,
of_trait: None,
self_ty: ty_first,
diff --git a/src/librustc_parse/parser/ty.rs b/src/librustc_parse/parser/ty.rs
index d1875a6..a4cc9fa 100644
--- a/src/librustc_parse/parser/ty.rs
+++ b/src/librustc_parse/parser/ty.rs
@@ -26,10 +26,12 @@
}
impl BoundModifiers {
- fn trait_bound_modifier(&self) -> TraitBoundModifier {
- match self.maybe {
- Some(_) => TraitBoundModifier::Maybe,
- None => TraitBoundModifier::None,
+ fn to_trait_bound_modifier(&self) -> TraitBoundModifier {
+ match (self.maybe, self.maybe_const) {
+ (None, None) => TraitBoundModifier::None,
+ (Some(_), None) => TraitBoundModifier::Maybe,
+ (None, Some(_)) => TraitBoundModifier::MaybeConst,
+ (Some(_), Some(_)) => TraitBoundModifier::MaybeConstMaybe,
}
}
}
@@ -214,7 +216,7 @@
) -> PResult<'a, TyKind> {
assert_ne!(self.token, token::Question);
- let poly_trait_ref = PolyTraitRef::new(generic_params, path, None, lo.to(self.prev_span));
+ let poly_trait_ref = PolyTraitRef::new(generic_params, path, lo.to(self.prev_span));
let mut bounds = vec![GenericBound::Trait(poly_trait_ref, TraitBoundModifier::None)];
if parse_plus {
self.eat_plus(); // `+`, or `+=` gets split and `+` is discarded
@@ -556,9 +558,9 @@
self.expect(&token::CloseDelim(token::Paren))?;
}
- let constness = modifiers.maybe_const.map(|_| ast::Constness::NotConst);
- let poly_trait = PolyTraitRef::new(lifetime_defs, path, constness, lo.to(self.prev_span));
- Ok(GenericBound::Trait(poly_trait, modifiers.trait_bound_modifier()))
+ let modifier = modifiers.to_trait_bound_modifier();
+ let poly_trait = PolyTraitRef::new(lifetime_defs, path, lo.to(self.prev_span));
+ Ok(GenericBound::Trait(poly_trait, modifier))
}
/// Optionally parses `for<$generic_params>`.
diff --git a/src/librustc_privacy/lib.rs b/src/librustc_privacy/lib.rs
index 6349054..60bf271 100644
--- a/src/librustc_privacy/lib.rs
+++ b/src/librustc_privacy/lib.rs
@@ -91,7 +91,7 @@
let ty::GenericPredicates { parent: _, predicates } = predicates;
for (predicate, _span) in predicates {
match predicate {
- ty::Predicate::Trait(poly_predicate) => {
+ ty::Predicate::Trait(poly_predicate, _) => {
let ty::TraitPredicate { trait_ref } = *poly_predicate.skip_binder();
if self.visit_trait(trait_ref) {
return true;
@@ -1235,7 +1235,7 @@
// The traits' privacy in bodies is already checked as a part of trait object types.
let bounds = rustc_typeck::hir_trait_to_predicates(self.tcx, trait_ref);
- for (trait_predicate, _) in bounds.trait_bounds {
+ for (trait_predicate, _, _) in bounds.trait_bounds {
if self.visit_trait(*trait_predicate.skip_binder()) {
return;
}
diff --git a/src/librustc_save_analysis/sig.rs b/src/librustc_save_analysis/sig.rs
index 779d3f5..a9d2bfa 100644
--- a/src/librustc_save_analysis/sig.rs
+++ b/src/librustc_save_analysis/sig.rs
@@ -486,6 +486,7 @@
unsafety,
polarity,
defaultness,
+ constness,
ref generics,
ref of_trait,
ref self_ty,
@@ -499,6 +500,9 @@
text.push_str("unsafe ");
}
text.push_str("impl");
+ if constness == ast::Constness::Const {
+ text.push_str(" const");
+ }
let generics_sig = generics.make(offset + text.len(), id, scx)?;
text.push_str(&generics_sig.text);
diff --git a/src/librustc_traits/lowering/mod.rs b/src/librustc_traits/lowering/mod.rs
index 4b4fa4b..b77c603 100644
--- a/src/librustc_traits/lowering/mod.rs
+++ b/src/librustc_traits/lowering/mod.rs
@@ -94,7 +94,7 @@
use rustc::ty::Predicate;
match self {
- Predicate::Trait(predicate) => predicate.lower(),
+ Predicate::Trait(predicate, _) => predicate.lower(),
Predicate::RegionOutlives(predicate) => predicate.lower(),
Predicate::TypeOutlives(predicate) => predicate.lower(),
Predicate::Projection(predicate) => predicate.lower(),
diff --git a/src/librustc_ty/ty.rs b/src/librustc_ty/ty.rs
index d47e543..8b62403 100644
--- a/src/librustc_ty/ty.rs
+++ b/src/librustc_ty/ty.rs
@@ -2,7 +2,7 @@
use rustc::session::CrateDisambiguator;
use rustc::traits::{self};
use rustc::ty::subst::Subst;
-use rustc::ty::{self, ToPredicate, Ty, TyCtxt};
+use rustc::ty::{self, ToPredicate, Ty, TyCtxt, WithConstness};
use rustc_data_structures::svh::Svh;
use rustc_hir as hir;
use rustc_hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
@@ -58,6 +58,7 @@
def_id: sized_trait,
substs: tcx.mk_substs_trait(ty, &[]),
})
+ .without_const()
.to_predicate();
let predicates = tcx.predicates_of(adtdef.did).predicates;
if predicates.iter().any(|(p, _)| *p == sized_predicate) { vec![] } else { vec![ty] }
diff --git a/src/librustc_typeck/astconv.rs b/src/librustc_typeck/astconv.rs
index 047c14c..89eeed8 100644
--- a/src/librustc_typeck/astconv.rs
+++ b/src/librustc_typeck/astconv.rs
@@ -3,6 +3,8 @@
//! The main routine here is `ast_ty_to_ty()`; each use is parameterized by an
//! instance of `AstConv`.
+// ignore-tidy-filelength
+
use crate::collect::PlaceholderHirTyCollector;
use crate::lint;
use crate::middle::lang_items::SizedTraitLangItem;
@@ -17,7 +19,7 @@
use rustc::traits::error_reporting::report_object_safety_error;
use rustc::traits::wf::object_region_bounds;
use rustc::ty::subst::{self, InternalSubsts, Subst, SubstsRef};
-use rustc::ty::{self, Const, DefIdTree, ToPredicate, Ty, TyCtxt, TypeFoldable};
+use rustc::ty::{self, Const, DefIdTree, ToPredicate, Ty, TyCtxt, TypeFoldable, WithConstness};
use rustc::ty::{GenericParamDef, GenericParamDefKind};
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_errors::{pluralize, struct_span_err, Applicability, DiagnosticId};
@@ -31,7 +33,7 @@
use rustc_span::{MultiSpan, Span, DUMMY_SP};
use rustc_target::spec::abi;
use smallvec::SmallVec;
-use syntax::ast;
+use syntax::ast::{self, Constness};
use syntax::util::lev_distance::find_best_match_for_name;
use std::collections::BTreeSet;
@@ -48,6 +50,8 @@
fn item_def_id(&self) -> Option<DefId>;
+ fn default_constness_for_trait_bounds(&self) -> Constness;
+
/// Returns predicates in scope of the form `X: Foo`, where `X` is
/// a type parameter `X` with the given id `def_id`. This is a
/// subset of the full set of predicates.
@@ -918,6 +922,7 @@
&self,
trait_ref: &hir::TraitRef<'_>,
span: Span,
+ constness: Constness,
self_ty: Ty<'tcx>,
bounds: &mut Bounds<'tcx>,
speculative: bool,
@@ -946,7 +951,7 @@
);
let poly_trait_ref = ty::Binder::bind(ty::TraitRef::new(trait_def_id, substs));
- bounds.trait_bounds.push((poly_trait_ref, span));
+ bounds.trait_bounds.push((poly_trait_ref, span, constness));
let mut dup_bindings = FxHashMap::default();
for binding in &assoc_bindings {
@@ -992,12 +997,14 @@
pub fn instantiate_poly_trait_ref(
&self,
poly_trait_ref: &hir::PolyTraitRef<'_>,
+ constness: Constness,
self_ty: Ty<'tcx>,
bounds: &mut Bounds<'tcx>,
) -> Option<Vec<Span>> {
self.instantiate_poly_trait_ref_inner(
&poly_trait_ref.trait_ref,
poly_trait_ref.span,
+ constness,
self_ty,
bounds,
false,
@@ -1180,18 +1187,22 @@
let mut trait_bounds = Vec::new();
let mut region_bounds = Vec::new();
+ let constness = self.default_constness_for_trait_bounds();
for ast_bound in ast_bounds {
match *ast_bound {
hir::GenericBound::Trait(ref b, hir::TraitBoundModifier::None) => {
- trait_bounds.push(b)
+ trait_bounds.push((b, constness))
+ }
+ hir::GenericBound::Trait(ref b, hir::TraitBoundModifier::MaybeConst) => {
+ trait_bounds.push((b, Constness::NotConst))
}
hir::GenericBound::Trait(_, hir::TraitBoundModifier::Maybe) => {}
hir::GenericBound::Outlives(ref l) => region_bounds.push(l),
}
}
- for bound in trait_bounds {
- let _ = self.instantiate_poly_trait_ref(bound, param_ty, bounds);
+ for (bound, constness) in trait_bounds {
+ let _ = self.instantiate_poly_trait_ref(bound, constness, param_ty, bounds);
}
bounds.region_bounds.extend(
@@ -1225,7 +1236,7 @@
let mut bounds = Bounds::default();
self.add_bounds(param_ty, ast_bounds, &mut bounds);
- bounds.trait_bounds.sort_by_key(|(t, _)| t.def_id());
+ bounds.trait_bounds.sort_by_key(|(t, _, _)| t.def_id());
bounds.implicitly_sized = if let SizedByDefault::Yes = sized_by_default {
if !self.is_unsized(ast_bounds, span) { Some(span) } else { None }
@@ -1416,15 +1427,21 @@
let mut potential_assoc_types = Vec::new();
let dummy_self = self.tcx().types.trait_object_dummy_self;
for trait_bound in trait_bounds.iter().rev() {
- let cur_potential_assoc_types =
- self.instantiate_poly_trait_ref(trait_bound, dummy_self, &mut bounds);
+ let cur_potential_assoc_types = self.instantiate_poly_trait_ref(
+ trait_bound,
+ Constness::NotConst,
+ dummy_self,
+ &mut bounds,
+ );
potential_assoc_types.extend(cur_potential_assoc_types.into_iter().flatten());
}
// Expand trait aliases recursively and check that only one regular (non-auto) trait
// is used and no 'maybe' bounds are used.
- let expanded_traits =
- traits::expand_trait_aliases(tcx, bounds.trait_bounds.iter().cloned());
+ let expanded_traits = traits::expand_trait_aliases(
+ tcx,
+ bounds.trait_bounds.iter().map(|&(a, b, _)| (a.clone(), b)),
+ );
let (mut auto_traits, regular_traits): (Vec<_>, Vec<_>) =
expanded_traits.partition(|i| tcx.trait_is_auto(i.trait_ref().def_id()));
if regular_traits.len() > 1 {
@@ -1480,16 +1497,18 @@
let regular_traits_refs_spans = bounds
.trait_bounds
.into_iter()
- .filter(|(trait_ref, _)| !tcx.trait_is_auto(trait_ref.def_id()));
+ .filter(|(trait_ref, _, _)| !tcx.trait_is_auto(trait_ref.def_id()));
- for (base_trait_ref, span) in regular_traits_refs_spans {
+ for (base_trait_ref, span, constness) in regular_traits_refs_spans {
+ assert_eq!(constness, ast::Constness::NotConst);
+
for trait_ref in traits::elaborate_trait_ref(tcx, base_trait_ref) {
debug!(
"conv_object_ty_poly_trait_ref: observing object predicate `{:?}`",
trait_ref
);
match trait_ref {
- ty::Predicate::Trait(pred) => {
+ ty::Predicate::Trait(pred, _) => {
associated_types.entry(span).or_default().extend(
tcx.associated_items(pred.def_id())
.filter(|item| item.kind == ty::AssocKind::Type)
@@ -2948,7 +2967,7 @@
/// A list of trait bounds. So if you had `T: Debug` this would be
/// `T: Debug`. Note that the self-type is explicit here.
- pub trait_bounds: Vec<(ty::PolyTraitRef<'tcx>, Span)>,
+ pub trait_bounds: Vec<(ty::PolyTraitRef<'tcx>, Span, Constness)>,
/// A list of projection equality bounds. So if you had `T:
/// Iterator<Item = u32>` this would include `<T as
@@ -2979,7 +2998,7 @@
def_id: sized,
substs: tcx.mk_substs_trait(param_ty, &[]),
});
- (trait_ref.to_predicate(), span)
+ (trait_ref.without_const().to_predicate(), span)
})
});
@@ -2996,11 +3015,10 @@
let outlives = ty::OutlivesPredicate(param_ty, region_bound);
(ty::Binder::bind(outlives).to_predicate(), span)
})
- .chain(
- self.trait_bounds
- .iter()
- .map(|&(bound_trait_ref, span)| (bound_trait_ref.to_predicate(), span)),
- )
+ .chain(self.trait_bounds.iter().map(|&(bound_trait_ref, span, constness)| {
+ let predicate = bound_trait_ref.with_constness(constness).to_predicate();
+ (predicate, span)
+ }))
.chain(
self.projection_bounds
.iter()
diff --git a/src/librustc_typeck/check/autoderef.rs b/src/librustc_typeck/check/autoderef.rs
index 3ea5de9..e4dec97 100644
--- a/src/librustc_typeck/check/autoderef.rs
+++ b/src/librustc_typeck/check/autoderef.rs
@@ -5,7 +5,7 @@
use rustc::session::DiagnosticMessageId;
use rustc::traits::{self, TraitEngine};
use rustc::ty::adjustment::{Adjust, Adjustment, OverloadedDeref};
-use rustc::ty::{self, TraitRef, Ty, TyCtxt};
+use rustc::ty::{self, TraitRef, Ty, TyCtxt, WithConstness};
use rustc::ty::{ToPredicate, TypeFoldable};
use rustc_errors::struct_span_err;
use rustc_hir as hir;
@@ -122,8 +122,11 @@
let cause = traits::ObligationCause::misc(self.span, self.body_id);
- let obligation =
- traits::Obligation::new(cause.clone(), self.param_env, trait_ref.to_predicate());
+ let obligation = traits::Obligation::new(
+ cause.clone(),
+ self.param_env,
+ trait_ref.without_const().to_predicate(),
+ );
if !self.infcx.predicate_may_hold(&obligation) {
debug!("overloaded_deref_ty: cannot match obligation");
return None;
diff --git a/src/librustc_typeck/check/coercion.rs b/src/librustc_typeck/check/coercion.rs
index 8c8e064..54b32c3 100644
--- a/src/librustc_typeck/check/coercion.rs
+++ b/src/librustc_typeck/check/coercion.rs
@@ -564,7 +564,7 @@
let obligation = queue.remove(0);
debug!("coerce_unsized resolve step: {:?}", obligation);
let trait_ref = match obligation.predicate {
- ty::Predicate::Trait(ref tr) if traits.contains(&tr.def_id()) => {
+ ty::Predicate::Trait(ref tr, _) if traits.contains(&tr.def_id()) => {
if unsize_did == tr.def_id() {
let sty = &tr.skip_binder().input_types().nth(1).unwrap().kind;
if let ty::Tuple(..) = sty {
diff --git a/src/librustc_typeck/check/dropck.rs b/src/librustc_typeck/check/dropck.rs
index f4aa53a..32773e2 100644
--- a/src/librustc_typeck/check/dropck.rs
+++ b/src/librustc_typeck/check/dropck.rs
@@ -232,7 +232,7 @@
let predicate_matches_closure = |p: &'_ Predicate<'tcx>| {
let mut relator: SimpleEqRelation<'tcx> = SimpleEqRelation::new(tcx, self_param_env);
match (predicate, p) {
- (Predicate::Trait(a), Predicate::Trait(b)) => relator.relate(a, b).is_ok(),
+ (Predicate::Trait(a, _), Predicate::Trait(b, _)) => relator.relate(a, b).is_ok(),
(Predicate::Projection(a), Predicate::Projection(b)) => {
relator.relate(a, b).is_ok()
}
diff --git a/src/librustc_typeck/check/method/confirm.rs b/src/librustc_typeck/check/method/confirm.rs
index 636ea5b..2012a2a 100644
--- a/src/librustc_typeck/check/method/confirm.rs
+++ b/src/librustc_typeck/check/method/confirm.rs
@@ -569,7 +569,7 @@
traits::elaborate_predicates(self.tcx, predicates.predicates.clone())
.filter_map(|predicate| match predicate {
- ty::Predicate::Trait(trait_pred) if trait_pred.def_id() == sized_def_id => {
+ ty::Predicate::Trait(trait_pred, _) if trait_pred.def_id() == sized_def_id => {
Some(trait_pred)
}
_ => None,
diff --git a/src/librustc_typeck/check/method/mod.rs b/src/librustc_typeck/check/method/mod.rs
index 711c285..c1cf352 100644
--- a/src/librustc_typeck/check/method/mod.rs
+++ b/src/librustc_typeck/check/method/mod.rs
@@ -17,7 +17,7 @@
use rustc::ty::subst::Subst;
use rustc::ty::subst::{InternalSubsts, SubstsRef};
use rustc::ty::GenericParamDefKind;
-use rustc::ty::{self, ToPolyTraitRef, ToPredicate, TraitRef, Ty, TypeFoldable};
+use rustc::ty::{self, ToPolyTraitRef, ToPredicate, TraitRef, Ty, TypeFoldable, WithConstness};
use rustc_data_structures::sync::Lrc;
use rustc_errors::{Applicability, DiagnosticBuilder};
use rustc_hir as hir;
@@ -322,7 +322,7 @@
span,
self.body_id,
self.param_env,
- poly_trait_ref.to_predicate(),
+ poly_trait_ref.without_const().to_predicate(),
);
// Now we want to know if this can be matched
diff --git a/src/librustc_typeck/check/method/probe.rs b/src/librustc_typeck/check/method/probe.rs
index 9d8f571..2adf125 100644
--- a/src/librustc_typeck/check/method/probe.rs
+++ b/src/librustc_typeck/check/method/probe.rs
@@ -25,6 +25,7 @@
use rustc::ty::GenericParamDefKind;
use rustc::ty::{
self, ParamEnvAnd, ToPolyTraitRef, ToPredicate, TraitRef, Ty, TyCtxt, TypeFoldable,
+ WithConstness,
};
use rustc_data_structures::fx::FxHashSet;
use rustc_data_structures::sync::Lrc;
@@ -824,7 +825,7 @@
// FIXME: do we want to commit to this behavior for param bounds?
let bounds = self.param_env.caller_bounds.iter().filter_map(|predicate| match *predicate {
- ty::Predicate::Trait(ref trait_predicate) => {
+ ty::Predicate::Trait(ref trait_predicate, _) => {
match trait_predicate.skip_binder().trait_ref.self_ty().kind {
ty::Param(ref p) if *p == param_ty => Some(trait_predicate.to_poly_trait_ref()),
_ => None,
@@ -1394,7 +1395,7 @@
}
TraitCandidate(trait_ref) => {
- let predicate = trait_ref.to_predicate();
+ let predicate = trait_ref.without_const().to_predicate();
let obligation = traits::Obligation::new(cause, self.param_env, predicate);
if !self.predicate_may_hold(&obligation) {
if self.probe(|_| self.select_trait_candidate(trait_ref).is_err()) {
@@ -1428,7 +1429,7 @@
let o = self.resolve_vars_if_possible(&o);
if !self.predicate_may_hold(&o) {
result = ProbeResult::NoMatch;
- if let &ty::Predicate::Trait(ref pred) = &o.predicate {
+ if let &ty::Predicate::Trait(ref pred, _) = &o.predicate {
possibly_unsatisfied_predicates.push(pred.skip_binder().trait_ref);
}
}
diff --git a/src/librustc_typeck/check/method/suggest.rs b/src/librustc_typeck/check/method/suggest.rs
index 88de265..e9942fa 100644
--- a/src/librustc_typeck/check/method/suggest.rs
+++ b/src/librustc_typeck/check/method/suggest.rs
@@ -9,7 +9,7 @@
use rustc::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
use rustc::traits::Obligation;
use rustc::ty::print::with_crate_prefix;
-use rustc::ty::{self, ToPolyTraitRef, ToPredicate, Ty, TyCtxt, TypeFoldable};
+use rustc::ty::{self, ToPolyTraitRef, ToPredicate, Ty, TyCtxt, TypeFoldable, WithConstness};
use rustc_data_structures::fx::FxHashSet;
use rustc_errors::{pluralize, struct_span_err, Applicability, DiagnosticBuilder};
use rustc_hir as hir;
@@ -57,7 +57,7 @@
span,
self.body_id,
self.param_env,
- poly_trait_ref.to_predicate(),
+ poly_trait_ref.without_const().to_predicate(),
);
self.predicate_may_hold(&obligation)
})
diff --git a/src/librustc_typeck/check/mod.rs b/src/librustc_typeck/check/mod.rs
index f7df630..3818750 100644
--- a/src/librustc_typeck/check/mod.rs
+++ b/src/librustc_typeck/check/mod.rs
@@ -90,6 +90,7 @@
use crate::astconv::{AstConv, PathSeg};
use crate::middle::lang_items;
use crate::namespace::Namespace;
+use rustc::hir::map::blocks::FnLikeNode;
use rustc::hir::map::Map;
use rustc::infer::canonical::{Canonical, OriginalQueryValues, QueryResponse};
use rustc::infer::error_reporting::TypeAnnotationNeeded::E0282;
@@ -112,7 +113,7 @@
use rustc::ty::util::{Discr, IntTypeExt, Representability};
use rustc::ty::{
self, AdtKind, CanonicalUserType, Const, GenericParamDefKind, RegionKind, ToPolyTraitRef,
- ToPredicate, Ty, TyCtxt, UserType,
+ ToPredicate, Ty, TyCtxt, UserType, WithConstness,
};
use rustc_data_structures::captures::Captures;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
@@ -1421,7 +1422,7 @@
inherited.register_predicate(traits::Obligation::new(
cause,
param_env,
- trait_ref.to_predicate(),
+ trait_ref.without_const().to_predicate(),
));
}
}
@@ -2610,6 +2611,16 @@
None
}
+ fn default_constness_for_trait_bounds(&self) -> ast::Constness {
+ // FIXME: refactor this into a method
+ let node = self.tcx.hir().get(self.body_id);
+ if let Some(fn_like) = FnLikeNode::from_node(node) {
+ fn_like.constness()
+ } else {
+ ast::Constness::NotConst
+ }
+ }
+
fn get_type_parameter_bounds(&self, _: Span, def_id: DefId) -> ty::GenericPredicates<'tcx> {
let tcx = self.tcx;
let hir_id = tcx.hir().as_local_hir_id(def_id).unwrap();
@@ -2621,7 +2632,7 @@
parent: None,
predicates: tcx.arena.alloc_from_iter(self.param_env.caller_bounds.iter().filter_map(
|&predicate| match predicate {
- ty::Predicate::Trait(ref data)
+ ty::Predicate::Trait(ref data, _)
if data.skip_binder().self_ty().is_param(index) =>
{
// HACK(eddyb) should get the original `Span`.
@@ -3693,7 +3704,7 @@
ty::Predicate::Projection(ref data) => {
Some((data.to_poly_trait_ref(self.tcx), obligation))
}
- ty::Predicate::Trait(ref data) => Some((data.to_poly_trait_ref(), obligation)),
+ ty::Predicate::Trait(ref data, _) => Some((data.to_poly_trait_ref(), obligation)),
ty::Predicate::Subtype(..) => None,
ty::Predicate::RegionOutlives(..) => None,
ty::Predicate::TypeOutlives(..) => None,
@@ -3996,7 +4007,7 @@
continue;
}
- if let ty::Predicate::Trait(predicate) = error.obligation.predicate {
+ if let ty::Predicate::Trait(predicate, _) = error.obligation.predicate {
// Collect the argument position for all arguments that could have caused this
// `FulfillmentError`.
let mut referenced_in = final_arg_types
@@ -4040,7 +4051,7 @@
if let hir::ExprKind::Path(qpath) = &path.kind {
if let hir::QPath::Resolved(_, path) = &qpath {
for error in errors {
- if let ty::Predicate::Trait(predicate) = error.obligation.predicate {
+ if let ty::Predicate::Trait(predicate, _) = error.obligation.predicate {
// If any of the type arguments in this path segment caused the
// `FullfillmentError`, point at its span (#61860).
for arg in path
diff --git a/src/librustc_typeck/check/wfcheck.rs b/src/librustc_typeck/check/wfcheck.rs
index 910e680..8281182 100644
--- a/src/librustc_typeck/check/wfcheck.rs
+++ b/src/librustc_typeck/check/wfcheck.rs
@@ -6,7 +6,9 @@
use rustc::session::parse::feature_err;
use rustc::traits::{self, ObligationCause, ObligationCauseCode};
use rustc::ty::subst::{InternalSubsts, Subst};
-use rustc::ty::{self, AdtKind, GenericParamDefKind, ToPredicate, Ty, TyCtxt, TypeFoldable};
+use rustc::ty::{
+ self, AdtKind, GenericParamDefKind, ToPredicate, Ty, TyCtxt, TypeFoldable, WithConstness,
+};
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_errors::{struct_span_err, DiagnosticBuilder};
use rustc_hir::def_id::DefId;
@@ -953,7 +955,8 @@
substs: fcx.tcx.mk_substs_trait(receiver_ty, &[]),
};
- let obligation = traits::Obligation::new(cause, fcx.param_env, trait_ref.to_predicate());
+ let obligation =
+ traits::Obligation::new(cause, fcx.param_env, trait_ref.without_const().to_predicate());
if fcx.predicate_must_hold_modulo_regions(&obligation) {
true
diff --git a/src/librustc_typeck/collect.rs b/src/librustc_typeck/collect.rs
index 9eee31c..5821977 100644
--- a/src/librustc_typeck/collect.rs
+++ b/src/librustc_typeck/collect.rs
@@ -20,6 +20,7 @@
use crate::lint;
use crate::middle::resolve_lifetime as rl;
use crate::middle::weak_lang_items;
+use rustc::hir::map::blocks::FnLikeNode;
use rustc::hir::map::Map;
use rustc::middle::codegen_fn_attrs::{CodegenFnAttrFlags, CodegenFnAttrs};
use rustc::mir::mono::Linkage;
@@ -30,7 +31,7 @@
use rustc::ty::subst::{InternalSubsts, Subst};
use rustc::ty::util::Discr;
use rustc::ty::util::IntTypeExt;
-use rustc::ty::{self, AdtKind, Const, DefIdTree, ToPolyTraitRef, Ty, TyCtxt};
+use rustc::ty::{self, AdtKind, Const, DefIdTree, ToPolyTraitRef, Ty, TyCtxt, WithConstness};
use rustc::ty::{ReprOptions, ToPredicate};
use rustc_data_structures::captures::Captures;
use rustc_data_structures::fx::FxHashMap;
@@ -286,6 +287,22 @@
Some(self.item_def_id)
}
+ fn default_constness_for_trait_bounds(&self) -> ast::Constness {
+ // FIXME: refactor this into a method
+ let hir_id = self
+ .tcx
+ .hir()
+ .as_local_hir_id(self.item_def_id)
+ .expect("Non-local call to local provider is_const_fn");
+
+ let node = self.tcx.hir().get(hir_id);
+ if let Some(fn_like) = FnLikeNode::from_node(node) {
+ fn_like.constness()
+ } else {
+ ast::Constness::NotConst
+ }
+ }
+
fn get_type_parameter_bounds(&self, span: Span, def_id: DefId) -> ty::GenericPredicates<'tcx> {
self.tcx.at(span).type_param_predicates((self.item_def_id, def_id))
}
@@ -409,7 +426,8 @@
// Implied `Self: Trait` and supertrait bounds.
if param_id == item_hir_id {
let identity_trait_ref = ty::TraitRef::identity(tcx, item_def_id);
- extend = Some((identity_trait_ref.to_predicate(), item.span));
+ extend =
+ Some((identity_trait_ref.without_const().to_predicate(), item.span));
}
generics
}
@@ -430,7 +448,7 @@
icx.type_parameter_bounds_in_generics(ast_generics, param_id, ty, OnlySelfBounds(true))
.into_iter()
.filter(|(predicate, _)| match predicate {
- ty::Predicate::Trait(ref data) => data.skip_binder().self_ty().is_param(index),
+ ty::Predicate::Trait(ref data, _) => data.skip_binder().self_ty().is_param(index),
_ => false,
}),
);
@@ -451,6 +469,7 @@
ty: Ty<'tcx>,
only_self_bounds: OnlySelfBounds,
) -> Vec<(ty::Predicate<'tcx>, Span)> {
+ let constness = self.default_constness_for_trait_bounds();
let from_ty_params = ast_generics
.params
.iter()
@@ -459,7 +478,7 @@
_ => None,
})
.flat_map(|bounds| bounds.iter())
- .flat_map(|b| predicates_from_bound(self, ty, b));
+ .flat_map(|b| predicates_from_bound(self, ty, b, constness));
let from_where_clauses = ast_generics
.where_clause
@@ -479,7 +498,7 @@
};
bp.bounds.iter().filter_map(move |b| bt.map(|bt| (bt, b)))
})
- .flat_map(|(bt, b)| predicates_from_bound(self, bt, b));
+ .flat_map(|(bt, b)| predicates_from_bound(self, bt, b, constness));
from_ty_params.chain(from_where_clauses).collect()
}
@@ -855,7 +874,7 @@
// which will, in turn, reach indirect supertraits.
for &(pred, span) in superbounds {
debug!("superbound: {:?}", pred);
- if let ty::Predicate::Trait(bound) = pred {
+ if let ty::Predicate::Trait(bound, _) = pred {
tcx.at(span).super_predicates_of(bound.def_id());
}
}
@@ -2054,7 +2073,7 @@
let span = tcx.def_span(def_id);
result.predicates =
tcx.arena.alloc_from_iter(result.predicates.iter().copied().chain(std::iter::once((
- ty::TraitRef::identity(tcx, def_id).to_predicate(),
+ ty::TraitRef::identity(tcx, def_id).without_const().to_predicate(),
span,
))));
}
@@ -2104,6 +2123,7 @@
let mut is_default_impl_trait = None;
let icx = ItemCtxt::new(tcx, def_id);
+ let constness = icx.default_constness_for_trait_bounds();
const NO_GENERICS: &hir::Generics<'_> = &hir::Generics::empty();
@@ -2228,7 +2248,10 @@
// (see below). Recall that a default impl is not itself an impl, but rather a
// set of defaults that can be incorporated into another impl.
if let Some(trait_ref) = is_default_impl_trait {
- predicates.push((trait_ref.to_poly_trait_ref().to_predicate(), tcx.def_span(def_id)));
+ predicates.push((
+ trait_ref.to_poly_trait_ref().without_const().to_predicate(),
+ tcx.def_span(def_id),
+ ));
}
// Collect the region predicates that were declared inline as
@@ -2302,11 +2325,18 @@
for bound in bound_pred.bounds.iter() {
match bound {
- &hir::GenericBound::Trait(ref poly_trait_ref, _) => {
+ &hir::GenericBound::Trait(ref poly_trait_ref, modifier) => {
+ let constness = match modifier {
+ hir::TraitBoundModifier::MaybeConst => ast::Constness::NotConst,
+ hir::TraitBoundModifier::None => constness,
+ hir::TraitBoundModifier::Maybe => bug!("this wasn't handled"),
+ };
+
let mut bounds = Bounds::default();
let _ = AstConv::instantiate_poly_trait_ref(
&icx,
poly_trait_ref,
+ constness,
ty,
&mut bounds,
);
@@ -2482,11 +2512,18 @@
astconv: &dyn AstConv<'tcx>,
param_ty: Ty<'tcx>,
bound: &'tcx hir::GenericBound<'tcx>,
+ constness: ast::Constness,
) -> Vec<(ty::Predicate<'tcx>, Span)> {
match *bound {
- hir::GenericBound::Trait(ref tr, hir::TraitBoundModifier::None) => {
+ hir::GenericBound::Trait(ref tr, modifier) => {
+ let constness = match modifier {
+ hir::TraitBoundModifier::Maybe => return vec![],
+ hir::TraitBoundModifier::MaybeConst => ast::Constness::NotConst,
+ hir::TraitBoundModifier::None => constness,
+ };
+
let mut bounds = Bounds::default();
- let _ = astconv.instantiate_poly_trait_ref(tr, param_ty, &mut bounds);
+ let _ = astconv.instantiate_poly_trait_ref(tr, constness, param_ty, &mut bounds);
bounds.predicates(astconv.tcx(), param_ty)
}
hir::GenericBound::Outlives(ref lifetime) => {
@@ -2494,7 +2531,6 @@
let pred = ty::Binder::bind(ty::OutlivesPredicate(param_ty, region));
vec![(ty::Predicate::TypeOutlives(pred), lifetime.span)]
}
- hir::GenericBound::Trait(_, hir::TraitBoundModifier::Maybe) => vec![],
}
}
diff --git a/src/librustc_typeck/lib.rs b/src/librustc_typeck/lib.rs
index 7e63a02..3d27f91 100644
--- a/src/librustc_typeck/lib.rs
+++ b/src/librustc_typeck/lib.rs
@@ -380,6 +380,7 @@
&item_cx,
hir_trait,
DUMMY_SP,
+ syntax::ast::Constness::NotConst,
tcx.types.err,
&mut bounds,
true,
diff --git a/src/librustdoc/clean/auto_trait.rs b/src/librustdoc/clean/auto_trait.rs
index f37f692..27f8059 100644
--- a/src/librustdoc/clean/auto_trait.rs
+++ b/src/librustdoc/clean/auto_trait.rs
@@ -462,7 +462,7 @@
.filter(|p| {
!orig_bounds.contains(p)
|| match p {
- &&ty::Predicate::Trait(pred) => pred.def_id() == sized_trait,
+ ty::Predicate::Trait(pred, _) => pred.def_id() == sized_trait,
_ => false,
}
})
diff --git a/src/librustdoc/clean/blanket_impl.rs b/src/librustdoc/clean/blanket_impl.rs
index 525b1b2..18ebd25 100644
--- a/src/librustdoc/clean/blanket_impl.rs
+++ b/src/librustdoc/clean/blanket_impl.rs
@@ -1,7 +1,7 @@
use rustc::infer::InferOk;
use rustc::traits;
use rustc::ty::subst::Subst;
-use rustc::ty::ToPredicate;
+use rustc::ty::{ToPredicate, WithConstness};
use rustc_hir as hir;
use rustc_hir::def_id::LOCAL_CRATE;
use rustc_span::DUMMY_SP;
@@ -64,7 +64,7 @@
match infcx.evaluate_obligation(&traits::Obligation::new(
cause,
param_env,
- trait_ref.to_predicate(),
+ trait_ref.without_const().to_predicate(),
)) {
Ok(eval_result) => eval_result.may_apply(),
Err(traits::OverflowError) => true, // overflow doesn't mean yes *or* no
diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index 20a5a6c..7a7d69c 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -482,7 +482,7 @@
use rustc::ty::Predicate;
match *self {
- Predicate::Trait(ref pred) => Some(pred.clean(cx)),
+ Predicate::Trait(ref pred, _) => Some(pred.clean(cx)),
Predicate::Subtype(ref pred) => Some(pred.clean(cx)),
Predicate::RegionOutlives(ref pred) => pred.clean(cx),
Predicate::TypeOutlives(ref pred) => pred.clean(cx),
diff --git a/src/librustdoc/clean/simplify.rs b/src/librustdoc/clean/simplify.rs
index c7b12d3..2b59c60 100644
--- a/src/librustdoc/clean/simplify.rs
+++ b/src/librustdoc/clean/simplify.rs
@@ -141,7 +141,7 @@
.predicates
.iter()
.filter_map(|(pred, _)| {
- if let ty::Predicate::Trait(ref pred) = *pred {
+ if let ty::Predicate::Trait(ref pred, _) = *pred {
if pred.skip_binder().trait_ref.self_ty() == self_ty {
Some(pred.def_id())
} else {
diff --git a/src/librustdoc/doctree.rs b/src/librustdoc/doctree.rs
index 178ba69..218674b 100644
--- a/src/librustdoc/doctree.rs
+++ b/src/librustdoc/doctree.rs
@@ -203,6 +203,7 @@
pub unsafety: hir::Unsafety,
pub polarity: hir::ImplPolarity,
pub defaultness: hir::Defaultness,
+ pub constness: ast::Constness,
pub generics: &'hir hir::Generics<'hir>,
pub trait_: &'hir Option<hir::TraitRef<'hir>>,
pub for_: &'hir hir::Ty<'hir>,
diff --git a/src/librustdoc/html/format.rs b/src/librustdoc/html/format.rs
index 6434dcc..79923fc 100644
--- a/src/librustdoc/html/format.rs
+++ b/src/librustdoc/html/format.rs
@@ -361,6 +361,7 @@
let modifier_str = match modifier {
hir::TraitBoundModifier::None => "",
hir::TraitBoundModifier::Maybe => "?",
+ hir::TraitBoundModifier::MaybeConst => "?const",
};
if f.alternate() {
write!(f, "{}{:#}", modifier_str, ty.print())
diff --git a/src/librustdoc/visit_ast.rs b/src/librustdoc/visit_ast.rs
index fdff187..d3d45cc 100644
--- a/src/librustdoc/visit_ast.rs
+++ b/src/librustdoc/visit_ast.rs
@@ -562,6 +562,7 @@
unsafety,
polarity,
defaultness,
+ constness,
ref generics,
ref of_trait,
self_ty,
@@ -576,6 +577,7 @@
unsafety,
polarity,
defaultness,
+ constness,
generics,
trait_: of_trait,
for_: self_ty,
diff --git a/src/libstd/sys_common/net.rs b/src/libstd/sys_common/net.rs
index c7d4828..135e830 100644
--- a/src/libstd/sys_common/net.rs
+++ b/src/libstd/sys_common/net.rs
@@ -13,75 +13,43 @@
use libc::{c_int, c_void};
-#[cfg(not(any(
- target_os = "dragonfly",
- target_os = "freebsd",
- target_os = "ios",
- target_os = "macos",
- target_os = "openbsd",
- target_os = "netbsd",
- target_os = "solaris",
- target_os = "haiku",
- target_os = "l4re"
-)))]
-use crate::sys::net::netc::IPV6_ADD_MEMBERSHIP;
-#[cfg(not(any(
- target_os = "dragonfly",
- target_os = "freebsd",
- target_os = "ios",
- target_os = "macos",
- target_os = "openbsd",
- target_os = "netbsd",
- target_os = "solaris",
- target_os = "haiku",
- target_os = "l4re"
-)))]
-use crate::sys::net::netc::IPV6_DROP_MEMBERSHIP;
-#[cfg(any(
- target_os = "dragonfly",
- target_os = "freebsd",
- target_os = "ios",
- target_os = "macos",
- target_os = "openbsd",
- target_os = "netbsd",
- target_os = "solaris",
- target_os = "haiku",
- target_os = "l4re"
-))]
-use crate::sys::net::netc::IPV6_JOIN_GROUP as IPV6_ADD_MEMBERSHIP;
-#[cfg(any(
- target_os = "dragonfly",
- target_os = "freebsd",
- target_os = "ios",
- target_os = "macos",
- target_os = "openbsd",
- target_os = "netbsd",
- target_os = "solaris",
- target_os = "haiku",
- target_os = "l4re"
-))]
-use crate::sys::net::netc::IPV6_LEAVE_GROUP as IPV6_DROP_MEMBERSHIP;
+cfg_if::cfg_if! {
+ if #[cfg(any(
+ target_os = "dragonfly", target_os = "freebsd",
+ target_os = "ios", target_os = "macos",
+ target_os = "openbsd", target_os = "netbsd",
+ target_os = "solaris", target_os = "haiku", target_os = "l4re"))] {
+ use crate::sys::net::netc::IPV6_JOIN_GROUP as IPV6_ADD_MEMBERSHIP;
+ use crate::sys::net::netc::IPV6_LEAVE_GROUP as IPV6_DROP_MEMBERSHIP;
+ } else {
+ use crate::sys::net::netc::IPV6_ADD_MEMBERSHIP;
+ use crate::sys::net::netc::IPV6_DROP_MEMBERSHIP;
+ }
+}
-#[cfg(any(
- target_os = "linux",
- target_os = "android",
- target_os = "dragonfly",
- target_os = "freebsd",
- target_os = "openbsd",
- target_os = "netbsd",
- target_os = "haiku"
-))]
-use libc::MSG_NOSIGNAL;
-#[cfg(not(any(
- target_os = "linux",
- target_os = "android",
- target_os = "dragonfly",
- target_os = "freebsd",
- target_os = "openbsd",
- target_os = "netbsd",
- target_os = "haiku"
-)))]
-const MSG_NOSIGNAL: c_int = 0x0;
+cfg_if::cfg_if! {
+ if #[cfg(any(
+ target_os = "linux", target_os = "android",
+ target_os = "dragonfly", target_os = "freebsd",
+ target_os = "openbsd", target_os = "netbsd",
+ target_os = "haiku"))] {
+ use libc::MSG_NOSIGNAL;
+ } else {
+ const MSG_NOSIGNAL: c_int = 0x0;
+ }
+}
+
+cfg_if::cfg_if! {
+ if #[cfg(any(
+ target_os = "dragonfly", target_os = "freebsd",
+ target_os = "openbsd", target_os = "netbsd",
+ target_os = "solaris"))] {
+ use libc::c_uchar;
+ type IpV4MultiCastType = c_uchar;
+ } else {
+ type IpV4MultiCastType = c_int;
+ }
+}
////////////////////////////////////////////////////////////////////////////////
// sockaddr and misc bindings
@@ -566,20 +534,30 @@
}
pub fn set_multicast_loop_v4(&self, multicast_loop_v4: bool) -> io::Result<()> {
- setsockopt(&self.inner, c::IPPROTO_IP, c::IP_MULTICAST_LOOP, multicast_loop_v4 as c_int)
+ setsockopt(
+ &self.inner,
+ c::IPPROTO_IP,
+ c::IP_MULTICAST_LOOP,
+ multicast_loop_v4 as IpV4MultiCastType,
+ )
}
pub fn multicast_loop_v4(&self) -> io::Result<bool> {
- let raw: c_int = getsockopt(&self.inner, c::IPPROTO_IP, c::IP_MULTICAST_LOOP)?;
+ let raw: IpV4MultiCastType = getsockopt(&self.inner, c::IPPROTO_IP, c::IP_MULTICAST_LOOP)?;
Ok(raw != 0)
}
pub fn set_multicast_ttl_v4(&self, multicast_ttl_v4: u32) -> io::Result<()> {
- setsockopt(&self.inner, c::IPPROTO_IP, c::IP_MULTICAST_TTL, multicast_ttl_v4 as c_int)
+ setsockopt(
+ &self.inner,
+ c::IPPROTO_IP,
+ c::IP_MULTICAST_TTL,
+ multicast_ttl_v4 as IpV4MultiCastType,
+ )
}
pub fn multicast_ttl_v4(&self) -> io::Result<u32> {
- let raw: c_int = getsockopt(&self.inner, c::IPPROTO_IP, c::IP_MULTICAST_TTL)?;
+ let raw: IpV4MultiCastType = getsockopt(&self.inner, c::IPPROTO_IP, c::IP_MULTICAST_TTL)?;
Ok(raw as u32)
}
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index a5a4eb1..5f38ac4 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -266,12 +266,24 @@
/// small, positive ids.
pub const DUMMY_NODE_ID: NodeId = NodeId::MAX;
-/// A modifier on a bound, currently this is only used for `?Sized`, where the
-/// modifier is `Maybe`. Negative bounds should also be handled here.
+/// A modifier on a bound, e.g., `?Sized` or `?const Trait`.
+///
+/// Negative bounds should also be handled here.
#[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Debug)]
pub enum TraitBoundModifier {
+ /// No modifiers
None,
+
+ /// `?Trait`
Maybe,
+
+ /// `?const Trait`
+ MaybeConst,
+
+ /// `?const ?Trait`
+ //
+ // This parses but will be rejected during AST validation.
+ MaybeConstMaybe,
}
/// The AST represents all type param bounds as types.
@@ -1033,7 +1045,7 @@
pub fn to_bound(&self) -> Option<GenericBound> {
match &self.kind {
ExprKind::Path(None, path) => Some(GenericBound::Trait(
- PolyTraitRef::new(Vec::new(), path.clone(), None, self.span),
+ PolyTraitRef::new(Vec::new(), path.clone(), self.span),
TraitBoundModifier::None,
)),
_ => None,
@@ -2158,7 +2170,8 @@
}
}
-#[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)]
+#[derive(Copy, Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Debug)]
+#[derive(HashStable_Generic)]
pub enum Constness {
Const,
NotConst,
@@ -2376,15 +2389,6 @@
pub struct TraitRef {
pub path: Path,
pub ref_id: NodeId,
-
- /// The `const` modifier, if any, that appears before this trait.
- ///
- /// | | `constness` |
- /// |----------------|-----------------------------|
- /// | `Trait` | `None` |
- /// | `const Trait` | `Some(Constness::Const)` |
- /// | `?const Trait` | `Some(Constness::NotConst)` |
- pub constness: Option<Constness>,
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
@@ -2399,15 +2403,10 @@
}
impl PolyTraitRef {
- pub fn new(
- generic_params: Vec<GenericParam>,
- path: Path,
- constness: Option<Constness>,
- span: Span,
- ) -> Self {
+ pub fn new(generic_params: Vec<GenericParam>, path: Path, span: Span) -> Self {
PolyTraitRef {
bound_generic_params: generic_params,
- trait_ref: TraitRef { path, constness, ref_id: DUMMY_NODE_ID },
+ trait_ref: TraitRef { path, ref_id: DUMMY_NODE_ID },
span,
}
}
@@ -2618,6 +2617,7 @@
unsafety: Unsafety,
polarity: ImplPolarity,
defaultness: Defaultness,
+ constness: Constness,
generics: Generics,
/// The trait being implemented, if any.
diff --git a/src/libsyntax/mut_visit.rs b/src/libsyntax/mut_visit.rs
index 750d054..4a460c5 100644
--- a/src/libsyntax/mut_visit.rs
+++ b/src/libsyntax/mut_visit.rs
@@ -838,8 +838,7 @@
}
}
-pub fn noop_visit_trait_ref<T: MutVisitor>(tr: &mut TraitRef, vis: &mut T) {
- let TraitRef { path, ref_id, constness: _ } = tr;
+pub fn noop_visit_trait_ref<T: MutVisitor>(TraitRef { path, ref_id }: &mut TraitRef, vis: &mut T) {
vis.visit_path(path);
vis.visit_id(ref_id);
}
@@ -922,6 +921,7 @@
unsafety: _,
polarity: _,
defaultness: _,
+ constness: _,
generics,
of_trait,
self_ty,
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index bc67980..3927e4f 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -1230,6 +1230,7 @@
unsafety,
polarity,
defaultness,
+ constness,
ref generics,
ref of_trait,
ref self_ty,
@@ -1240,6 +1241,7 @@
self.print_defaultness(defaultness);
self.print_unsafety(unsafety);
self.word_nbsp("impl");
+ self.print_constness(constness);
if !generics.params.is_empty() {
self.print_generic_params(&generics.params);
@@ -2773,6 +2775,13 @@
}
}
+ crate fn print_constness(&mut self, s: ast::Constness) {
+ match s {
+ ast::Constness::Const => self.word_nbsp("const"),
+ ast::Constness::NotConst => {}
+ }
+ }
+
crate fn print_is_auto(&mut self, s: ast::IsAuto) {
match s {
ast::IsAuto::Yes => self.word_nbsp("auto"),
diff --git a/src/libsyntax/visit.rs b/src/libsyntax/visit.rs
index d03a9df..946a0d2 100644
--- a/src/libsyntax/visit.rs
+++ b/src/libsyntax/visit.rs
@@ -312,6 +312,7 @@
unsafety: _,
polarity: _,
defaultness: _,
+ constness: _,
ref generics,
ref of_trait,
ref self_ty,
diff --git a/src/test/ui/lint/lint-uppercase-variables.rs b/src/test/ui/lint/lint-uppercase-variables.rs
index 86a3950..a98b4f2 100644
--- a/src/test/ui/lint/lint-uppercase-variables.rs
+++ b/src/test/ui/lint/lint-uppercase-variables.rs
@@ -25,6 +25,16 @@
//~^^^ WARN unused variable: `Foo`
}
+ let Foo = foo::Foo::Foo;
+ //~^ ERROR variable `Foo` should have a snake case name
+ //~^^ WARN `Foo` is named the same as one of the variants of the type `foo::Foo`
+ //~^^^ WARN unused variable: `Foo`
+
+ fn in_param(Foo: foo::Foo) {}
+ //~^ ERROR variable `Foo` should have a snake case name
+ //~^^ WARN `Foo` is named the same as one of the variants of the type `foo::Foo`
+ //~^^^ WARN unused variable: `Foo`
+
test(1);
let _ = Something { X: 0 };
diff --git a/src/test/ui/lint/lint-uppercase-variables.stderr b/src/test/ui/lint/lint-uppercase-variables.stderr
index b937832..a38f3e7 100644
--- a/src/test/ui/lint/lint-uppercase-variables.stderr
+++ b/src/test/ui/lint/lint-uppercase-variables.stderr
@@ -6,6 +6,18 @@
|
= note: `#[warn(bindings_with_variant_name)]` on by default
+warning[E0170]: pattern binding `Foo` is named the same as one of the variants of the type `foo::Foo`
+ --> $DIR/lint-uppercase-variables.rs:28:9
+ |
+LL | let Foo = foo::Foo::Foo;
+ | ^^^ help: to match on the variant, qualify the path: `foo::Foo::Foo`
+
+warning[E0170]: pattern binding `Foo` is named the same as one of the variants of the type `foo::Foo`
+ --> $DIR/lint-uppercase-variables.rs:33:17
+ |
+LL | fn in_param(Foo: foo::Foo) {}
+ | ^^^ help: to match on the variant, qualify the path: `foo::Foo::Foo`
+
warning: unused variable: `Foo`
--> $DIR/lint-uppercase-variables.rs:22:9
|
@@ -19,6 +31,18 @@
| ^^^^^^
= note: `#[warn(unused_variables)]` implied by `#[warn(unused)]`
+warning: unused variable: `Foo`
+ --> $DIR/lint-uppercase-variables.rs:28:9
+ |
+LL | let Foo = foo::Foo::Foo;
+ | ^^^ help: consider prefixing with an underscore: `_Foo`
+
+warning: unused variable: `Foo`
+ --> $DIR/lint-uppercase-variables.rs:33:17
+ |
+LL | fn in_param(Foo: foo::Foo) {}
+ | ^^^ help: consider prefixing with an underscore: `_Foo`
+
error: structure field `X` should have a snake case name
--> $DIR/lint-uppercase-variables.rs:10:5
|
@@ -49,6 +73,18 @@
LL | Foo => {}
| ^^^ help: convert the identifier to snake case (notice the capitalization): `foo`
-error: aborting due to 4 previous errors
+error: variable `Foo` should have a snake case name
+ --> $DIR/lint-uppercase-variables.rs:28:9
+ |
+LL | let Foo = foo::Foo::Foo;
+ | ^^^ help: convert the identifier to snake case (notice the capitalization): `foo`
+
+error: variable `Foo` should have a snake case name
+ --> $DIR/lint-uppercase-variables.rs:33:17
+ |
+LL | fn in_param(Foo: foo::Foo) {}
+ | ^^^ help: convert the identifier to snake case (notice the capitalization): `foo`
+
+error: aborting due to 6 previous errors
For more information about this error, try `rustc --explain E0170`.
diff --git a/src/test/ui/pattern/issue-68393-let-pat-assoc-constant.rs b/src/test/ui/pattern/issue-68393-let-pat-assoc-constant.rs
new file mode 100644
index 0000000..95ead6b
--- /dev/null
+++ b/src/test/ui/pattern/issue-68393-let-pat-assoc-constant.rs
@@ -0,0 +1,26 @@
+pub enum EFoo {
+ A,
+}
+
+pub trait Foo {
+ const X: EFoo;
+}
+
+struct Abc;
+
+impl Foo for Abc {
+ const X: EFoo = EFoo::A;
+}
+
+struct Def;
+impl Foo for Def {
+ const X: EFoo = EFoo::A;
+}
+
+pub fn test<A: Foo, B: Foo>(arg: EFoo, A::X: EFoo) {
+ //~^ ERROR associated consts cannot be referenced in patterns
+ let A::X = arg;
+ //~^ ERROR associated consts cannot be referenced in patterns
+}
+
+fn main() {}
diff --git a/src/test/ui/pattern/issue-68393-let-pat-assoc-constant.stderr b/src/test/ui/pattern/issue-68393-let-pat-assoc-constant.stderr
new file mode 100644
index 0000000..54ecc24
--- /dev/null
+++ b/src/test/ui/pattern/issue-68393-let-pat-assoc-constant.stderr
@@ -0,0 +1,15 @@
+error[E0158]: associated consts cannot be referenced in patterns
+ --> $DIR/issue-68393-let-pat-assoc-constant.rs:20:40
+ |
+LL | pub fn test<A: Foo, B: Foo>(arg: EFoo, A::X: EFoo) {
+ | ^^^^
+
+error[E0158]: associated consts cannot be referenced in patterns
+ --> $DIR/issue-68393-let-pat-assoc-constant.rs:22:9
+ |
+LL | let A::X = arg;
+ | ^^^^
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0158`.
diff --git a/src/test/ui/pattern/issue-68394-let-pat-runtime-value.rs b/src/test/ui/pattern/issue-68394-let-pat-runtime-value.rs
new file mode 100644
index 0000000..f10a7f2
--- /dev/null
+++ b/src/test/ui/pattern/issue-68394-let-pat-runtime-value.rs
@@ -0,0 +1,5 @@
+fn main() {
+ let x = 255u8;
+ let 0u8..=x = 0;
+ //~^ ERROR runtime values cannot be referenced in patterns
+}
diff --git a/src/test/ui/pattern/issue-68394-let-pat-runtime-value.stderr b/src/test/ui/pattern/issue-68394-let-pat-runtime-value.stderr
new file mode 100644
index 0000000..c1508bd
--- /dev/null
+++ b/src/test/ui/pattern/issue-68394-let-pat-runtime-value.stderr
@@ -0,0 +1,9 @@
+error[E0080]: runtime values cannot be referenced in patterns
+ --> $DIR/issue-68394-let-pat-runtime-value.rs:3:15
+ |
+LL | let 0u8..=x = 0;
+ | ^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0080`.
diff --git a/src/test/ui/pattern/issue-68396-let-float-bug.rs b/src/test/ui/pattern/issue-68396-let-float-bug.rs
new file mode 100644
index 0000000..afc599a
--- /dev/null
+++ b/src/test/ui/pattern/issue-68396-let-float-bug.rs
@@ -0,0 +1,7 @@
+fn main() {
+ let 1234567890123456789012345678901234567890e-340: f64 = 0.0;
+ //~^ ERROR could not evaluate float literal (see issue #31407)
+
+ fn param(1234567890123456789012345678901234567890e-340: f64) {}
+ //~^ ERROR could not evaluate float literal (see issue #31407)
+}
diff --git a/src/test/ui/pattern/issue-68396-let-float-bug.stderr b/src/test/ui/pattern/issue-68396-let-float-bug.stderr
new file mode 100644
index 0000000..618aa4b
--- /dev/null
+++ b/src/test/ui/pattern/issue-68396-let-float-bug.stderr
@@ -0,0 +1,15 @@
+error[E0080]: could not evaluate float literal (see issue #31407)
+ --> $DIR/issue-68396-let-float-bug.rs:2:9
+ |
+LL | let 1234567890123456789012345678901234567890e-340: f64 = 0.0;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0080]: could not evaluate float literal (see issue #31407)
+ --> $DIR/issue-68396-let-float-bug.rs:5:14
+ |
+LL | fn param(1234567890123456789012345678901234567890e-340: f64) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0080`.
diff --git a/src/test/ui/pattern/usefulness/struct-pattern-match-useless.stderr b/src/test/ui/pattern/usefulness/struct-pattern-match-useless.stderr
index 5b0c930..0115fc0 100644
--- a/src/test/ui/pattern/usefulness/struct-pattern-match-useless.stderr
+++ b/src/test/ui/pattern/usefulness/struct-pattern-match-useless.stderr
@@ -1,8 +1,10 @@
error: unreachable pattern
--> $DIR/struct-pattern-match-useless.rs:12:9
|
+LL | Foo { x: _x, y: _y } => (),
+ | -------------------- matches any value
LL | Foo { .. } => ()
- | ^^^^^^^^^^
+ | ^^^^^^^^^^ unreachable pattern
|
note: lint level defined here
--> $DIR/struct-pattern-match-useless.rs:1:9
diff --git a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/feature-gate.gated.stderr b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/feature-gate.gated.stderr
index 0bf337a..e4f4d42 100644
--- a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/feature-gate.gated.stderr
+++ b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/feature-gate.gated.stderr
@@ -1,8 +1,8 @@
-error: `?const` on trait bounds is not yet implemented
- --> $DIR/feature-gate.rs:11:29
+error: fatal error triggered by #[rustc_error]
+ --> $DIR/feature-gate.rs:16:1
|
-LL | const fn get_assoc_const<S: ?const T>() -> i32 { <S as T>::CONST }
- | ^^^^^^^^
+LL | fn main() {}
+ | ^^^^^^^^^^^^
error: aborting due to previous error
diff --git a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/feature-gate.rs b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/feature-gate.rs
index cf1ed30..d600b53 100644
--- a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/feature-gate.rs
+++ b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/feature-gate.rs
@@ -3,6 +3,7 @@
#![cfg_attr(gated, feature(const_trait_bound_opt_out))]
#![allow(incomplete_features)]
+#![feature(rustc_attrs)]
trait T {
const CONST: i32;
@@ -10,6 +11,6 @@
const fn get_assoc_const<S: ?const T>() -> i32 { <S as T>::CONST }
//[stock]~^ ERROR `?const` on trait bounds is experimental
-//[stock,gated]~^^ ERROR `?const` on trait bounds is not yet implemented
-fn main() {}
+#[rustc_error]
+fn main() {} //[gated]~ ERROR fatal error triggered by #[rustc_error]
diff --git a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/feature-gate.stock.stderr b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/feature-gate.stock.stderr
index 6438800..fbd3840 100644
--- a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/feature-gate.stock.stderr
+++ b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/feature-gate.stock.stderr
@@ -1,5 +1,5 @@
error[E0658]: `?const` on trait bounds is experimental
- --> $DIR/feature-gate.rs:11:29
+ --> $DIR/feature-gate.rs:12:29
|
LL | const fn get_assoc_const<S: ?const T>() -> i32 { <S as T>::CONST }
| ^^^^^^
@@ -7,12 +7,6 @@
= note: for more information, see https://github.com/rust-lang/rust/issues/67794
= help: add `#![feature(const_trait_bound_opt_out)]` to the crate attributes to enable
-error: `?const` on trait bounds is not yet implemented
- --> $DIR/feature-gate.rs:11:29
- |
-LL | const fn get_assoc_const<S: ?const T>() -> i32 { <S as T>::CONST }
- | ^^^^^^^^
-
-error: aborting due to 2 previous errors
+error: aborting due to previous error
For more information about this error, try `rustc --explain E0658`.
diff --git a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-impl-trait.rs b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-impl-trait.rs
index e4e6bed..f5561a9 100644
--- a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-impl-trait.rs
+++ b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-impl-trait.rs
@@ -8,18 +8,14 @@
fn rpit() -> impl ?const T { S }
//~^ ERROR `?const` is not permitted in `impl Trait`
-//~| ERROR `?const` on trait bounds is not yet implemented
fn apit(_: impl ?const T) {}
//~^ ERROR `?const` is not permitted in `impl Trait`
-//~| ERROR `?const` on trait bounds is not yet implemented
fn rpit_assoc_bound() -> impl IntoIterator<Item: ?const T> { Some(S) }
//~^ ERROR `?const` is not permitted in `impl Trait`
-//~| ERROR `?const` on trait bounds is not yet implemented
fn apit_assoc_bound(_: impl IntoIterator<Item: ?const T>) {}
//~^ ERROR `?const` is not permitted in `impl Trait`
-//~| ERROR `?const` on trait bounds is not yet implemented
fn main() {}
diff --git a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-impl-trait.stderr b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-impl-trait.stderr
index f4abd4b..06cd00a 100644
--- a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-impl-trait.stderr
+++ b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-impl-trait.stderr
@@ -5,46 +5,22 @@
| ^^^^^^^^
error: `?const` is not permitted in `impl Trait`
- --> $DIR/in-impl-trait.rs:13:17
+ --> $DIR/in-impl-trait.rs:12:17
|
LL | fn apit(_: impl ?const T) {}
| ^^^^^^^^
error: `?const` is not permitted in `impl Trait`
- --> $DIR/in-impl-trait.rs:17:50
+ --> $DIR/in-impl-trait.rs:15:50
|
LL | fn rpit_assoc_bound() -> impl IntoIterator<Item: ?const T> { Some(S) }
| ^^^^^^^^
error: `?const` is not permitted in `impl Trait`
- --> $DIR/in-impl-trait.rs:21:48
+ --> $DIR/in-impl-trait.rs:18:48
|
LL | fn apit_assoc_bound(_: impl IntoIterator<Item: ?const T>) {}
| ^^^^^^^^
-error: `?const` on trait bounds is not yet implemented
- --> $DIR/in-impl-trait.rs:9:19
- |
-LL | fn rpit() -> impl ?const T { S }
- | ^^^^^^^^
-
-error: `?const` on trait bounds is not yet implemented
- --> $DIR/in-impl-trait.rs:13:17
- |
-LL | fn apit(_: impl ?const T) {}
- | ^^^^^^^^
-
-error: `?const` on trait bounds is not yet implemented
- --> $DIR/in-impl-trait.rs:17:50
- |
-LL | fn rpit_assoc_bound() -> impl IntoIterator<Item: ?const T> { Some(S) }
- | ^^^^^^^^
-
-error: `?const` on trait bounds is not yet implemented
- --> $DIR/in-impl-trait.rs:21:48
- |
-LL | fn apit_assoc_bound(_: impl IntoIterator<Item: ?const T>) {}
- | ^^^^^^^^
-
-error: aborting due to 8 previous errors
+error: aborting due to 4 previous errors
diff --git a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-bounds.rs b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-bounds.rs
index 4523b46..fc9ed5b 100644
--- a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-bounds.rs
+++ b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-bounds.rs
@@ -4,6 +4,5 @@
trait Super {}
trait T: ?const Super {}
//~^ ERROR `?const` is not permitted in supertraits
-//~| ERROR `?const` on trait bounds is not yet implemented
fn main() {}
diff --git a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-bounds.stderr b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-bounds.stderr
index 8003361..a0d8f95 100644
--- a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-bounds.stderr
+++ b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-bounds.stderr
@@ -4,11 +4,5 @@
LL | trait T: ?const Super {}
| ^^^^^^^^^^^^
-error: `?const` on trait bounds is not yet implemented
- --> $DIR/in-trait-bounds.rs:5:10
- |
-LL | trait T: ?const Super {}
- | ^^^^^^^^^^^^
-
-error: aborting due to 2 previous errors
+error: aborting due to previous error
diff --git a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-object.rs b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-object.rs
index 6cfca71..b3d1f48 100644
--- a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-object.rs
+++ b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-object.rs
@@ -9,14 +9,11 @@
// An inherent impl for the trait object `?const T`.
impl ?const T {}
//~^ ERROR `?const` is not permitted in trait objects
-//~| ERROR `?const` on trait bounds is not yet implemented
fn trait_object() -> &'static dyn ?const T { &S }
//~^ ERROR `?const` is not permitted in trait objects
-//~| ERROR `?const` on trait bounds is not yet implemented
fn trait_object_in_apit(_: impl IntoIterator<Item = Box<dyn ?const T>>) {}
//~^ ERROR `?const` is not permitted in trait objects
-//~| ERROR `?const` on trait bounds is not yet implemented
fn main() {}
diff --git a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-object.stderr b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-object.stderr
index c059f16..331fe04 100644
--- a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-object.stderr
+++ b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/in-trait-object.stderr
@@ -5,34 +5,16 @@
| ^^^^^^^^
error: `?const` is not permitted in trait objects
- --> $DIR/in-trait-object.rs:14:35
+ --> $DIR/in-trait-object.rs:13:35
|
LL | fn trait_object() -> &'static dyn ?const T { &S }
| ^^^^^^^^
error: `?const` is not permitted in trait objects
- --> $DIR/in-trait-object.rs:18:61
+ --> $DIR/in-trait-object.rs:16:61
|
LL | fn trait_object_in_apit(_: impl IntoIterator<Item = Box<dyn ?const T>>) {}
| ^^^^^^^^
-error: `?const` on trait bounds is not yet implemented
- --> $DIR/in-trait-object.rs:10:6
- |
-LL | impl ?const T {}
- | ^^^^^^^^
-
-error: `?const` on trait bounds is not yet implemented
- --> $DIR/in-trait-object.rs:14:35
- |
-LL | fn trait_object() -> &'static dyn ?const T { &S }
- | ^^^^^^^^
-
-error: `?const` on trait bounds is not yet implemented
- --> $DIR/in-trait-object.rs:18:61
- |
-LL | fn trait_object_in_apit(_: impl IntoIterator<Item = Box<dyn ?const T>>) {}
- | ^^^^^^^^
-
-error: aborting due to 6 previous errors
+error: aborting due to 3 previous errors
diff --git a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/with-maybe-sized.rs b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/with-maybe-sized.rs
index 425784f..c2c8689 100644
--- a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/with-maybe-sized.rs
+++ b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/with-maybe-sized.rs
@@ -3,6 +3,5 @@
struct S<T: ?const ?Sized>(std::marker::PhantomData<T>);
//~^ ERROR `?const` and `?` are mutually exclusive
-//~| ERROR `?const` on trait bounds is not yet implemented
fn main() {}
diff --git a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/with-maybe-sized.stderr b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/with-maybe-sized.stderr
index 44f6d46..e8e9d6c 100644
--- a/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/with-maybe-sized.stderr
+++ b/src/test/ui/rfc-2632-const-trait-impl/const-trait-bound-opt-out/with-maybe-sized.stderr
@@ -4,11 +4,5 @@
LL | struct S<T: ?const ?Sized>(std::marker::PhantomData<T>);
| ^^^^^^^^^^^^^
-error: `?const` on trait bounds is not yet implemented
- --> $DIR/with-maybe-sized.rs:4:13
- |
-LL | struct S<T: ?const ?Sized>(std::marker::PhantomData<T>);
- | ^^^^^^^^^^^^^
-
-error: aborting due to 2 previous errors
+error: aborting due to previous error
diff --git a/src/test/ui/rfc-2632-const-trait-impl/inherent-impl.rs b/src/test/ui/rfc-2632-const-trait-impl/inherent-impl.rs
index 9cffe75..7f064c0 100644
--- a/src/test/ui/rfc-2632-const-trait-impl/inherent-impl.rs
+++ b/src/test/ui/rfc-2632-const-trait-impl/inherent-impl.rs
@@ -1,5 +1,3 @@
-// compile-flags: -Z parse-only
-
#![feature(const_trait_impl)]
#![feature(const_trait_bound_opt_out)]
#![allow(incomplete_features)]
@@ -8,7 +6,12 @@
struct S;
trait T {}
+impl const S {}
+//~^ ERROR inherent impls cannot be `const`
+//~| ERROR const trait impls are not yet implemented
+
impl const T {}
-//~^ ERROR `const` cannot modify an inherent impl
+//~^ ERROR inherent impls cannot be `const`
+//~| ERROR const trait impls are not yet implemented
fn main() {}
diff --git a/src/test/ui/rfc-2632-const-trait-impl/inherent-impl.stderr b/src/test/ui/rfc-2632-const-trait-impl/inherent-impl.stderr
index 1d24557..508c6f4 100644
--- a/src/test/ui/rfc-2632-const-trait-impl/inherent-impl.stderr
+++ b/src/test/ui/rfc-2632-const-trait-impl/inherent-impl.stderr
@@ -1,10 +1,30 @@
-error: `const` cannot modify an inherent impl
- --> $DIR/inherent-impl.rs:11:6
+error: inherent impls cannot be `const`
+ --> $DIR/inherent-impl.rs:9:1
+ |
+LL | impl const S {}
+ | ^^^^^^^^^^^^^^^
+ |
+ = note: only trait implementations may be annotated with `const`
+
+error: inherent impls cannot be `const`
+ --> $DIR/inherent-impl.rs:13:1
|
LL | impl const T {}
- | ^^^^^
+ | ^^^^^^^^^^^^^^^
|
- = help: only a trait impl can be `const`
+ = note: only trait implementations may be annotated with `const`
-error: aborting due to previous error
+error: const trait impls are not yet implemented
+ --> $DIR/inherent-impl.rs:9:1
+ |
+LL | impl const S {}
+ | ^^^^^^^^^^^^^^^
+
+error: const trait impls are not yet implemented
+ --> $DIR/inherent-impl.rs:13:1
+ |
+LL | impl const T {}
+ | ^^^^^^^^^^^^^^^
+
+error: aborting due to 4 previous errors
diff --git a/src/tools/tidy/src/debug_artifacts.rs b/src/tools/tidy/src/debug_artifacts.rs
index 4664e2e..408be83 100644
--- a/src/tools/tidy/src/debug_artifacts.rs
+++ b/src/tools/tidy/src/debug_artifacts.rs
@@ -2,7 +2,7 @@
use std::path::{Path, PathBuf};
-const GRAPHVIZ_POSTFLOW_MSG: &'static str = "`borrowck_graphviz_postflow` attribute in test";
+const GRAPHVIZ_POSTFLOW_MSG: &str = "`borrowck_graphviz_postflow` attribute in test";
pub fn check(path: &Path, bad: &mut bool) {
let test_dir: PathBuf = path.join("test");
diff --git a/src/tools/tidy/src/error_codes_check.rs b/src/tools/tidy/src/error_codes_check.rs
index ebaa81d..428c57d 100644
--- a/src/tools/tidy/src/error_codes_check.rs
+++ b/src/tools/tidy/src/error_codes_check.rs
@@ -53,7 +53,7 @@
error_codes.insert(err_code.clone(), false);
}
// Now we extract the tests from the markdown file!
- let md = some_or_continue!(s.splitn(2, "include_str!(\"").skip(1).next());
+ let md = some_or_continue!(s.splitn(2, "include_str!(\"").nth(1));
let md_file_name = some_or_continue!(md.splitn(2, "\")").next());
let path = some_or_continue!(path.parent()).join(md_file_name);
match read_to_string(&path) {
@@ -84,7 +84,7 @@
let s = line.trim();
if s.starts_with("error[E") || s.starts_with("warning[E") {
if let Some(err_code) = s.splitn(2, ']').next() {
- if let Some(err_code) = err_code.splitn(2, '[').skip(1).next() {
+ if let Some(err_code) = err_code.splitn(2, '[').nth(1) {
let nb = error_codes.entry(err_code.to_owned()).or_insert(false);
*nb = true;
}
diff --git a/src/tools/tidy/src/features.rs b/src/tools/tidy/src/features.rs
index 325b45e..12f93a8 100644
--- a/src/tools/tidy/src/features.rs
+++ b/src/tools/tidy/src/features.rs
@@ -232,7 +232,7 @@
}
}
}
- return false;
+ false
}
pub fn collect_lang_features(base_src_path: &Path, bad: &mut bool) -> Features {
@@ -344,7 +344,7 @@
}
None
} else {
- let s = issue_str.split('(').nth(1).unwrap().split(')').nth(0).unwrap();
+ let s = issue_str.split('(').nth(1).unwrap().split(')').next().unwrap();
Some(s.parse().unwrap())
};
Some((name.to_owned(), Feature { level, since, has_gate_test: false, tracking_issue }))
diff --git a/src/tools/tidy/src/features/version.rs b/src/tools/tidy/src/features/version.rs
index c8c39ad..620be2f 100644
--- a/src/tools/tidy/src/features/version.rs
+++ b/src/tools/tidy/src/features/version.rs
@@ -38,7 +38,7 @@
let parts = [part()?, part()?, part()?];
- if let Some(_) = iter.next() {
+ if iter.next().is_some() {
// Ensure we don't have more than 3 parts.
return Err(ParseVersionError::WrongNumberOfParts);
}
diff --git a/src/tools/tidy/src/style.rs b/src/tools/tidy/src/style.rs
index b15c299..4247fcb3b 100644
--- a/src/tools/tidy/src/style.rs
+++ b/src/tools/tidy/src/style.rs
@@ -58,7 +58,7 @@
fn line_is_url(columns: usize, line: &str) -> bool {
// more basic check for error_codes.rs, to avoid complexity in implementing two state machines
if columns == ERROR_CODE_COLS {
- return line.starts_with("[") && line.contains("]:") && line.contains("http");
+ return line.starts_with('[') && line.contains("]:") && line.contains("http");
}
use self::LIUState::*;
