| //! The Rust abstract syntax tree module. |
| //! |
| //! This module contains common structures forming the language AST. |
| //! Two main entities in the module are [`Item`] (which represents an AST element with |
| //! additional metadata), and [`ItemKind`] (which represents a concrete type and contains |
| //! information specific to the type of the item). |
| //! |
| //! Other module items that worth mentioning: |
| //! - [`Ty`] and [`TyKind`]: A parsed Rust type. |
| //! - [`Expr`] and [`ExprKind`]: A parsed Rust expression. |
| //! - [`Pat`] and [`PatKind`]: A parsed Rust pattern. Patterns are often dual to expressions. |
| //! - [`Stmt`] and [`StmtKind`]: An executable action that does not return a value. |
| //! - [`FnDecl`], [`FnHeader`] and [`Param`]: Metadata associated with a function declaration. |
| //! - [`Generics`], [`GenericParam`], [`WhereClause`]: Metadata associated with generic parameters. |
| //! - [`EnumDef`] and [`Variant`]: Enum declaration. |
| //! - [`Lit`] and [`LitKind`]: Literal expressions. |
| //! - [`MacroDef`], [`MacStmtStyle`], [`Mac`], [`MacDelimeter`]: Macro definition and invocation. |
| //! - [`Attribute`]: Metadata associated with item. |
| //! - [`UnOp`], [`UnOpKind`], [`BinOp`], [`BinOpKind`]: Unary and binary operators. |
| |
| pub use GenericArgs::*; |
| pub use UnsafeSource::*; |
| pub use crate::util::parser::ExprPrecedence; |
| |
| pub use syntax_pos::symbol::{Ident, Symbol as Name}; |
| |
| use crate::ptr::P; |
| use crate::source_map::{dummy_spanned, respan, Spanned}; |
| use crate::token::{self, DelimToken}; |
| use crate::tokenstream::{TokenStream, TokenTree, DelimSpan}; |
| |
| use syntax_pos::symbol::{kw, sym, Symbol}; |
| use syntax_pos::{Span, DUMMY_SP}; |
| |
| use rustc_data_structures::stable_hasher::{HashStable, StableHasher}; |
| use rustc_data_structures::sync::Lrc; |
| use rustc_data_structures::thin_vec::ThinVec; |
| use rustc_index::vec::Idx; |
| use rustc_serialize::{self, Decoder, Encoder}; |
| use rustc_macros::HashStable_Generic; |
| |
| use std::iter; |
| use std::fmt; |
| |
| #[cfg(test)] |
| mod tests; |
| |
| /// A "Label" is an identifier of some point in sources, |
| /// e.g. in the following code: |
| /// |
| /// ```rust |
| /// 'outer: loop { |
| /// break 'outer; |
| /// } |
| /// ``` |
| /// |
| /// `'outer` is a label. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Copy, HashStable_Generic)] |
| pub struct Label { |
| pub ident: Ident, |
| } |
| |
| impl fmt::Debug for Label { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!(f, "label({:?})", self.ident) |
| } |
| } |
| |
| /// A "Lifetime" is an annotation of the scope in which variable |
| /// can be used, e.g. `'a` in `&'a i32`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Copy)] |
| pub struct Lifetime { |
| pub id: NodeId, |
| pub ident: Ident, |
| } |
| |
| impl fmt::Debug for Lifetime { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!( |
| f, |
| "lifetime({}: {})", |
| self.id, |
| self |
| ) |
| } |
| } |
| |
| impl fmt::Display for Lifetime { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!(f, "{}", self.ident.name) |
| } |
| } |
| |
| /// A "Path" is essentially Rust's notion of a name. |
| /// |
| /// It's represented as a sequence of identifiers, |
| /// along with a bunch of supporting information. |
| /// |
| /// E.g., `std::cmp::PartialEq`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Path { |
| pub span: Span, |
| /// The segments in the path: the things separated by `::`. |
| /// Global paths begin with `kw::PathRoot`. |
| pub segments: Vec<PathSegment>, |
| } |
| |
| impl PartialEq<Symbol> for Path { |
| fn eq(&self, symbol: &Symbol) -> bool { |
| self.segments.len() == 1 && { |
| self.segments[0].ident.name == *symbol |
| } |
| } |
| } |
| |
| impl<CTX> HashStable<CTX> for Path { |
| fn hash_stable(&self, hcx: &mut CTX, hasher: &mut StableHasher) { |
| self.segments.len().hash_stable(hcx, hasher); |
| for segment in &self.segments { |
| segment.ident.name.hash_stable(hcx, hasher); |
| } |
| } |
| } |
| |
| impl Path { |
| // Convert a span and an identifier to the corresponding |
| // one-segment path. |
| pub fn from_ident(ident: Ident) -> Path { |
| Path { |
| segments: vec![PathSegment::from_ident(ident)], |
| span: ident.span, |
| } |
| } |
| |
| pub fn is_global(&self) -> bool { |
| !self.segments.is_empty() && self.segments[0].ident.name == kw::PathRoot |
| } |
| } |
| |
| /// A segment of a path: an identifier, an optional lifetime, and a set of types. |
| /// |
| /// E.g., `std`, `String` or `Box<T>`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct PathSegment { |
| /// The identifier portion of this path segment. |
| pub ident: Ident, |
| |
| pub id: NodeId, |
| |
| /// Type/lifetime parameters attached to this path. They come in |
| /// two flavors: `Path<A,B,C>` and `Path(A,B) -> C`. |
| /// `None` means that no parameter list is supplied (`Path`), |
| /// `Some` means that parameter list is supplied (`Path<X, Y>`) |
| /// but it can be empty (`Path<>`). |
| /// `P` is used as a size optimization for the common case with no parameters. |
| pub args: Option<P<GenericArgs>>, |
| } |
| |
| impl PathSegment { |
| pub fn from_ident(ident: Ident) -> Self { |
| PathSegment { ident, id: DUMMY_NODE_ID, args: None } |
| } |
| pub fn path_root(span: Span) -> Self { |
| PathSegment::from_ident(Ident::new(kw::PathRoot, span)) |
| } |
| } |
| |
| /// The arguments of a path segment. |
| /// |
| /// E.g., `<A, B>` as in `Foo<A, B>` or `(A, B)` as in `Foo(A, B)`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum GenericArgs { |
| /// The `<'a, A, B, C>` in `foo::bar::baz::<'a, A, B, C>`. |
| AngleBracketed(AngleBracketedArgs), |
| /// The `(A, B)` and `C` in `Foo(A, B) -> C`. |
| Parenthesized(ParenthesizedArgs), |
| } |
| |
| impl GenericArgs { |
| pub fn is_parenthesized(&self) -> bool { |
| match *self { |
| Parenthesized(..) => true, |
| _ => false, |
| } |
| } |
| |
| pub fn is_angle_bracketed(&self) -> bool { |
| match *self { |
| AngleBracketed(..) => true, |
| _ => false, |
| } |
| } |
| |
| pub fn span(&self) -> Span { |
| match *self { |
| AngleBracketed(ref data) => data.span, |
| Parenthesized(ref data) => data.span, |
| } |
| } |
| } |
| |
| /// Concrete argument in the sequence of generic args. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum GenericArg { |
| /// `'a` in `Foo<'a>` |
| Lifetime(Lifetime), |
| /// `Bar` in `Foo<Bar>` |
| Type(P<Ty>), |
| /// `1` in `Foo<1>` |
| Const(AnonConst), |
| } |
| |
| impl GenericArg { |
| pub fn span(&self) -> Span { |
| match self { |
| GenericArg::Lifetime(lt) => lt.ident.span, |
| GenericArg::Type(ty) => ty.span, |
| GenericArg::Const(ct) => ct.value.span, |
| } |
| } |
| } |
| |
| /// A path like `Foo<'a, T>`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug, Default)] |
| pub struct AngleBracketedArgs { |
| /// The overall span. |
| pub span: Span, |
| /// The arguments for this path segment. |
| pub args: Vec<GenericArg>, |
| /// Constraints on associated types, if any. |
| /// E.g., `Foo<A = Bar, B: Baz>`. |
| pub constraints: Vec<AssocTyConstraint>, |
| } |
| |
| impl Into<Option<P<GenericArgs>>> for AngleBracketedArgs { |
| fn into(self) -> Option<P<GenericArgs>> { |
| Some(P(GenericArgs::AngleBracketed(self))) |
| } |
| } |
| |
| impl Into<Option<P<GenericArgs>>> for ParenthesizedArgs { |
| fn into(self) -> Option<P<GenericArgs>> { |
| Some(P(GenericArgs::Parenthesized(self))) |
| } |
| } |
| |
| /// A path like `Foo(A, B) -> C`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct ParenthesizedArgs { |
| /// Overall span |
| pub span: Span, |
| |
| /// `(A, B)` |
| pub inputs: Vec<P<Ty>>, |
| |
| /// `C` |
| pub output: Option<P<Ty>>, |
| } |
| |
| impl ParenthesizedArgs { |
| pub fn as_angle_bracketed_args(&self) -> AngleBracketedArgs { |
| AngleBracketedArgs { |
| span: self.span, |
| args: self.inputs.iter().cloned().map(|input| GenericArg::Type(input)).collect(), |
| constraints: vec![], |
| } |
| } |
| } |
| |
| pub use rustc_session::node_id::NodeId; |
| |
| /// `NodeId` used to represent the root of the crate. |
| pub const CRATE_NODE_ID: NodeId = NodeId::from_u32_const(0); |
| |
| /// When parsing and doing expansions, we initially give all AST nodes this AST |
| /// node value. Then later, in the renumber pass, we renumber them to have |
| /// 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. |
| #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Debug)] |
| pub enum TraitBoundModifier { |
| None, |
| Maybe, |
| } |
| |
| /// The AST represents all type param bounds as types. |
| /// `typeck::collect::compute_bounds` matches these against |
| /// the "special" built-in traits (see `middle::lang_items`) and |
| /// detects `Copy`, `Send` and `Sync`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum GenericBound { |
| Trait(PolyTraitRef, TraitBoundModifier), |
| Outlives(Lifetime), |
| } |
| |
| impl GenericBound { |
| pub fn span(&self) -> Span { |
| match self { |
| &GenericBound::Trait(ref t, ..) => t.span, |
| &GenericBound::Outlives(ref l) => l.ident.span, |
| } |
| } |
| } |
| |
| pub type GenericBounds = Vec<GenericBound>; |
| |
| /// Specifies the enforced ordering for generic parameters. In the future, |
| /// if we wanted to relax this order, we could override `PartialEq` and |
| /// `PartialOrd`, to allow the kinds to be unordered. |
| #[derive(PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy)] |
| pub enum ParamKindOrd { |
| Lifetime, |
| Type, |
| Const, |
| } |
| |
| impl fmt::Display for ParamKindOrd { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| match self { |
| ParamKindOrd::Lifetime => "lifetime".fmt(f), |
| ParamKindOrd::Type => "type".fmt(f), |
| ParamKindOrd::Const => "const".fmt(f), |
| } |
| } |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum GenericParamKind { |
| /// A lifetime definition (e.g., `'a: 'b + 'c + 'd`). |
| Lifetime, |
| Type { default: Option<P<Ty>> }, |
| Const { ty: P<Ty> }, |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct GenericParam { |
| pub id: NodeId, |
| pub ident: Ident, |
| pub attrs: ThinVec<Attribute>, |
| pub bounds: GenericBounds, |
| pub is_placeholder: bool, |
| pub kind: GenericParamKind, |
| } |
| |
| /// Represents lifetime, type and const parameters attached to a declaration of |
| /// a function, enum, trait, etc. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Generics { |
| pub params: Vec<GenericParam>, |
| pub where_clause: WhereClause, |
| pub span: Span, |
| } |
| |
| impl Default for Generics { |
| /// Creates an instance of `Generics`. |
| fn default() -> Generics { |
| Generics { |
| params: Vec::new(), |
| where_clause: WhereClause { |
| predicates: Vec::new(), |
| span: DUMMY_SP, |
| }, |
| span: DUMMY_SP, |
| } |
| } |
| } |
| |
| /// A where-clause in a definition. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct WhereClause { |
| pub predicates: Vec<WherePredicate>, |
| pub span: Span, |
| } |
| |
| /// A single predicate in a where-clause. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum WherePredicate { |
| /// A type binding (e.g., `for<'c> Foo: Send + Clone + 'c`). |
| BoundPredicate(WhereBoundPredicate), |
| /// A lifetime predicate (e.g., `'a: 'b + 'c`). |
| RegionPredicate(WhereRegionPredicate), |
| /// An equality predicate (unsupported). |
| EqPredicate(WhereEqPredicate), |
| } |
| |
| impl WherePredicate { |
| pub fn span(&self) -> Span { |
| match self { |
| &WherePredicate::BoundPredicate(ref p) => p.span, |
| &WherePredicate::RegionPredicate(ref p) => p.span, |
| &WherePredicate::EqPredicate(ref p) => p.span, |
| } |
| } |
| } |
| |
| /// A type bound. |
| /// |
| /// E.g., `for<'c> Foo: Send + Clone + 'c`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct WhereBoundPredicate { |
| pub span: Span, |
| /// Any generics from a `for` binding. |
| pub bound_generic_params: Vec<GenericParam>, |
| /// The type being bounded. |
| pub bounded_ty: P<Ty>, |
| /// Trait and lifetime bounds (`Clone + Send + 'static`). |
| pub bounds: GenericBounds, |
| } |
| |
| /// A lifetime predicate. |
| /// |
| /// E.g., `'a: 'b + 'c`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct WhereRegionPredicate { |
| pub span: Span, |
| pub lifetime: Lifetime, |
| pub bounds: GenericBounds, |
| } |
| |
| /// An equality predicate (unsupported). |
| /// |
| /// E.g., `T = int`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct WhereEqPredicate { |
| pub id: NodeId, |
| pub span: Span, |
| pub lhs_ty: P<Ty>, |
| pub rhs_ty: P<Ty>, |
| } |
| |
| pub use rustc_session::parse::CrateConfig; |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Crate { |
| pub module: Mod, |
| pub attrs: Vec<Attribute>, |
| pub span: Span, |
| } |
| |
| /// Possible values inside of compile-time attribute lists. |
| /// |
| /// E.g., the '..' in `#[name(..)]`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum NestedMetaItem { |
| /// A full MetaItem, for recursive meta items. |
| MetaItem(MetaItem), |
| /// A literal. |
| /// |
| /// E.g., `"foo"`, `64`, `true`. |
| Literal(Lit), |
| } |
| |
| /// A spanned compile-time attribute item. |
| /// |
| /// E.g., `#[test]`, `#[derive(..)]`, `#[rustfmt::skip]` or `#[feature = "foo"]`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct MetaItem { |
| pub path: Path, |
| pub kind: MetaItemKind, |
| pub span: Span, |
| } |
| |
| /// A compile-time attribute item. |
| /// |
| /// E.g., `#[test]`, `#[derive(..)]` or `#[feature = "foo"]`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum MetaItemKind { |
| /// Word meta item. |
| /// |
| /// E.g., `test` as in `#[test]`. |
| Word, |
| /// List meta item. |
| /// |
| /// E.g., `derive(..)` as in `#[derive(..)]`. |
| List(Vec<NestedMetaItem>), |
| /// Name value meta item. |
| /// |
| /// E.g., `feature = "foo"` as in `#[feature = "foo"]`. |
| NameValue(Lit), |
| } |
| |
| /// A block (`{ .. }`). |
| /// |
| /// E.g., `{ .. }` as in `fn foo() { .. }`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Block { |
| /// The statements in the block. |
| pub stmts: Vec<Stmt>, |
| pub id: NodeId, |
| /// Distinguishes between `unsafe { ... }` and `{ ... }`. |
| pub rules: BlockCheckMode, |
| pub span: Span, |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Pat { |
| pub id: NodeId, |
| pub kind: PatKind, |
| pub span: Span, |
| } |
| |
| impl Pat { |
| /// Attempt reparsing the pattern as a type. |
| /// This is intended for use by diagnostics. |
| pub fn to_ty(&self) -> Option<P<Ty>> { |
| let kind = match &self.kind { |
| // In a type expression `_` is an inference variable. |
| PatKind::Wild => TyKind::Infer, |
| // An IDENT pattern with no binding mode would be valid as path to a type. E.g. `u32`. |
| PatKind::Ident(BindingMode::ByValue(Mutability::Immutable), ident, None) => { |
| TyKind::Path(None, Path::from_ident(*ident)) |
| } |
| PatKind::Path(qself, path) => TyKind::Path(qself.clone(), path.clone()), |
| PatKind::Mac(mac) => TyKind::Mac(mac.clone()), |
| // `&mut? P` can be reinterpreted as `&mut? T` where `T` is `P` reparsed as a type. |
| PatKind::Ref(pat, mutbl) => pat |
| .to_ty() |
| .map(|ty| TyKind::Rptr(None, MutTy { ty, mutbl: *mutbl }))?, |
| // A slice/array pattern `[P]` can be reparsed as `[T]`, an unsized array, |
| // when `P` can be reparsed as a type `T`. |
| PatKind::Slice(pats) if pats.len() == 1 => pats[0].to_ty().map(TyKind::Slice)?, |
| // A tuple pattern `(P0, .., Pn)` can be reparsed as `(T0, .., Tn)` |
| // assuming `T0` to `Tn` are all syntactically valid as types. |
| PatKind::Tuple(pats) => { |
| let mut tys = Vec::with_capacity(pats.len()); |
| // FIXME(#48994) - could just be collected into an Option<Vec> |
| for pat in pats { |
| tys.push(pat.to_ty()?); |
| } |
| TyKind::Tup(tys) |
| } |
| _ => return None, |
| }; |
| |
| Some(P(Ty { |
| kind, |
| id: self.id, |
| span: self.span, |
| })) |
| } |
| |
| /// Walk top-down and call `it` in each place where a pattern occurs |
| /// starting with the root pattern `walk` is called on. If `it` returns |
| /// false then we will descend no further but siblings will be processed. |
| pub fn walk(&self, it: &mut impl FnMut(&Pat) -> bool) { |
| if !it(self) { |
| return; |
| } |
| |
| match &self.kind { |
| // Walk into the pattern associated with `Ident` (if any). |
| PatKind::Ident(_, _, Some(p)) => p.walk(it), |
| |
| // Walk into each field of struct. |
| PatKind::Struct(_, fields, _) => fields.iter().for_each(|field| field.pat.walk(it)), |
| |
| // Sequence of patterns. |
| PatKind::TupleStruct(_, s) |
| | PatKind::Tuple(s) |
| | PatKind::Slice(s) |
| | PatKind::Or(s) => s.iter().for_each(|p| p.walk(it)), |
| |
| // Trivial wrappers over inner patterns. |
| PatKind::Box(s) |
| | PatKind::Ref(s, _) |
| | PatKind::Paren(s) => s.walk(it), |
| |
| // These patterns do not contain subpatterns, skip. |
| PatKind::Wild |
| | PatKind::Rest |
| | PatKind::Lit(_) |
| | PatKind::Range(..) |
| | PatKind::Ident(..) |
| | PatKind::Path(..) |
| | PatKind::Mac(_) => {}, |
| } |
| } |
| |
| /// Is this a `..` pattern? |
| pub fn is_rest(&self) -> bool { |
| match self.kind { |
| PatKind::Rest => true, |
| _ => false, |
| } |
| } |
| } |
| |
| /// A single field in a struct pattern |
| /// |
| /// Patterns like the fields of Foo `{ x, ref y, ref mut z }` |
| /// are treated the same as` x: x, y: ref y, z: ref mut z`, |
| /// except is_shorthand is true |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct FieldPat { |
| /// The identifier for the field |
| pub ident: Ident, |
| /// The pattern the field is destructured to |
| pub pat: P<Pat>, |
| pub is_shorthand: bool, |
| pub attrs: ThinVec<Attribute>, |
| pub id: NodeId, |
| pub span: Span, |
| pub is_placeholder: bool, |
| } |
| |
| #[derive(Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, Copy)] |
| pub enum BindingMode { |
| ByRef(Mutability), |
| ByValue(Mutability), |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum RangeEnd { |
| Included(RangeSyntax), |
| Excluded, |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum RangeSyntax { |
| /// `...` |
| DotDotDot, |
| /// `..=` |
| DotDotEq, |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum PatKind { |
| /// Represents a wildcard pattern (`_`). |
| Wild, |
| |
| /// A `PatKind::Ident` may either be a new bound variable (`ref mut binding @ OPT_SUBPATTERN`), |
| /// or a unit struct/variant pattern, or a const pattern (in the last two cases the third |
| /// field must be `None`). Disambiguation cannot be done with parser alone, so it happens |
| /// during name resolution. |
| Ident(BindingMode, Ident, Option<P<Pat>>), |
| |
| /// A struct or struct variant pattern (e.g., `Variant {x, y, ..}`). |
| /// The `bool` is `true` in the presence of a `..`. |
| Struct(Path, Vec<FieldPat>, /* recovered */ bool), |
| |
| /// A tuple struct/variant pattern (`Variant(x, y, .., z)`). |
| TupleStruct(Path, Vec<P<Pat>>), |
| |
| /// An or-pattern `A | B | C`. |
| /// Invariant: `pats.len() >= 2`. |
| Or(Vec<P<Pat>>), |
| |
| /// A possibly qualified path pattern. |
| /// Unqualified path patterns `A::B::C` can legally refer to variants, structs, constants |
| /// or associated constants. Qualified path patterns `<A>::B::C`/`<A as Trait>::B::C` can |
| /// only legally refer to associated constants. |
| Path(Option<QSelf>, Path), |
| |
| /// A tuple pattern (`(a, b)`). |
| Tuple(Vec<P<Pat>>), |
| |
| /// A `box` pattern. |
| Box(P<Pat>), |
| |
| /// A reference pattern (e.g., `&mut (a, b)`). |
| Ref(P<Pat>, Mutability), |
| |
| /// A literal. |
| Lit(P<Expr>), |
| |
| /// A range pattern (e.g., `1...2`, `1..=2` or `1..2`). |
| Range(P<Expr>, P<Expr>, Spanned<RangeEnd>), |
| |
| /// A slice pattern `[a, b, c]`. |
| Slice(Vec<P<Pat>>), |
| |
| /// A rest pattern `..`. |
| /// |
| /// Syntactically it is valid anywhere. |
| /// |
| /// Semantically however, it only has meaning immediately inside: |
| /// - a slice pattern: `[a, .., b]`, |
| /// - a binding pattern immediately inside a slice pattern: `[a, r @ ..]`, |
| /// - a tuple pattern: `(a, .., b)`, |
| /// - a tuple struct/variant pattern: `$path(a, .., b)`. |
| /// |
| /// In all of these cases, an additional restriction applies, |
| /// only one rest pattern may occur in the pattern sequences. |
| Rest, |
| |
| /// Parentheses in patterns used for grouping (i.e., `(PAT)`). |
| Paren(P<Pat>), |
| |
| /// A macro pattern; pre-expansion. |
| Mac(Mac), |
| } |
| |
| #[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, |
| RustcEncodable, RustcDecodable, Debug, Copy, HashStable_Generic)] |
| pub enum Mutability { |
| Mutable, |
| Immutable, |
| } |
| |
| impl Mutability { |
| /// Returns `MutMutable` only if both `self` and `other` are mutable. |
| pub fn and(self, other: Self) -> Self { |
| match self { |
| Mutability::Mutable => other, |
| Mutability::Immutable => Mutability::Immutable, |
| } |
| } |
| |
| pub fn invert(self) -> Self { |
| match self { |
| Mutability::Mutable => Mutability::Immutable, |
| Mutability::Immutable => Mutability::Mutable, |
| } |
| } |
| |
| pub fn prefix_str(&self) -> &'static str { |
| match self { |
| Mutability::Mutable => "mut ", |
| Mutability::Immutable => "", |
| } |
| } |
| } |
| |
| /// The kind of borrow in an `AddrOf` expression, |
| /// e.g., `&place` or `&raw const place`. |
| #[derive(Clone, Copy, PartialEq, Eq, Debug)] |
| #[derive(RustcEncodable, RustcDecodable, HashStable_Generic)] |
| pub enum BorrowKind { |
| /// A raw borrow, `&raw const $expr` or `&raw mut $expr`. |
| /// The resulting type is either `*const T` or `*mut T` |
| /// where `T = typeof($expr)`. |
| Ref, |
| /// A normal borrow, `&$expr` or `&mut $expr`. |
| /// The resulting type is either `&'a T` or `&'a mut T` |
| /// where `T = typeof($expr)` and `'a` is some lifetime. |
| Raw, |
| } |
| |
| #[derive(Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, Copy)] |
| pub enum BinOpKind { |
| /// The `+` operator (addition) |
| Add, |
| /// The `-` operator (subtraction) |
| Sub, |
| /// The `*` operator (multiplication) |
| Mul, |
| /// The `/` operator (division) |
| Div, |
| /// The `%` operator (modulus) |
| Rem, |
| /// The `&&` operator (logical and) |
| And, |
| /// The `||` operator (logical or) |
| Or, |
| /// The `^` operator (bitwise xor) |
| BitXor, |
| /// The `&` operator (bitwise and) |
| BitAnd, |
| /// The `|` operator (bitwise or) |
| BitOr, |
| /// The `<<` operator (shift left) |
| Shl, |
| /// The `>>` operator (shift right) |
| Shr, |
| /// The `==` operator (equality) |
| Eq, |
| /// The `<` operator (less than) |
| Lt, |
| /// The `<=` operator (less than or equal to) |
| Le, |
| /// The `!=` operator (not equal to) |
| Ne, |
| /// The `>=` operator (greater than or equal to) |
| Ge, |
| /// The `>` operator (greater than) |
| Gt, |
| } |
| |
| impl BinOpKind { |
| pub fn to_string(&self) -> &'static str { |
| use BinOpKind::*; |
| match *self { |
| Add => "+", |
| Sub => "-", |
| Mul => "*", |
| Div => "/", |
| Rem => "%", |
| And => "&&", |
| Or => "||", |
| BitXor => "^", |
| BitAnd => "&", |
| BitOr => "|", |
| Shl => "<<", |
| Shr => ">>", |
| Eq => "==", |
| Lt => "<", |
| Le => "<=", |
| Ne => "!=", |
| Ge => ">=", |
| Gt => ">", |
| } |
| } |
| pub fn lazy(&self) -> bool { |
| match *self { |
| BinOpKind::And | BinOpKind::Or => true, |
| _ => false, |
| } |
| } |
| |
| pub fn is_shift(&self) -> bool { |
| match *self { |
| BinOpKind::Shl | BinOpKind::Shr => true, |
| _ => false, |
| } |
| } |
| |
| pub fn is_comparison(&self) -> bool { |
| use BinOpKind::*; |
| // Note for developers: please keep this as is; |
| // we want compilation to fail if another variant is added. |
| match *self { |
| Eq | Lt | Le | Ne | Gt | Ge => true, |
| And | Or | Add | Sub | Mul | Div | Rem | BitXor | BitAnd | BitOr | Shl | Shr => false, |
| } |
| } |
| |
| /// Returns `true` if the binary operator takes its arguments by value |
| pub fn is_by_value(&self) -> bool { |
| !self.is_comparison() |
| } |
| } |
| |
| pub type BinOp = Spanned<BinOpKind>; |
| |
| /// Unary operator. |
| /// |
| /// Note that `&data` is not an operator, it's an `AddrOf` expression. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug, Copy)] |
| pub enum UnOp { |
| /// The `*` operator for dereferencing |
| Deref, |
| /// The `!` operator for logical inversion |
| Not, |
| /// The `-` operator for negation |
| Neg, |
| } |
| |
| impl UnOp { |
| /// Returns `true` if the unary operator takes its argument by value |
| pub fn is_by_value(u: UnOp) -> bool { |
| match u { |
| UnOp::Neg | UnOp::Not => true, |
| _ => false, |
| } |
| } |
| |
| pub fn to_string(op: UnOp) -> &'static str { |
| match op { |
| UnOp::Deref => "*", |
| UnOp::Not => "!", |
| UnOp::Neg => "-", |
| } |
| } |
| } |
| |
| /// A statement |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Stmt { |
| pub id: NodeId, |
| pub kind: StmtKind, |
| pub span: Span, |
| } |
| |
| impl Stmt { |
| pub fn add_trailing_semicolon(mut self) -> Self { |
| self.kind = match self.kind { |
| StmtKind::Expr(expr) => StmtKind::Semi(expr), |
| StmtKind::Mac(mac) => { |
| StmtKind::Mac(mac.map(|(mac, _style, attrs)| (mac, MacStmtStyle::Semicolon, attrs))) |
| } |
| kind => kind, |
| }; |
| self |
| } |
| |
| pub fn is_item(&self) -> bool { |
| match self.kind { |
| StmtKind::Item(_) => true, |
| _ => false, |
| } |
| } |
| |
| pub fn is_expr(&self) -> bool { |
| match self.kind { |
| StmtKind::Expr(_) => true, |
| _ => false, |
| } |
| } |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum StmtKind { |
| /// A local (let) binding. |
| Local(P<Local>), |
| /// An item definition. |
| Item(P<Item>), |
| /// Expr without trailing semi-colon. |
| Expr(P<Expr>), |
| /// Expr with a trailing semi-colon. |
| Semi(P<Expr>), |
| /// Macro. |
| Mac(P<(Mac, MacStmtStyle, ThinVec<Attribute>)>), |
| } |
| |
| #[derive(Clone, Copy, PartialEq, RustcEncodable, RustcDecodable, Debug)] |
| pub enum MacStmtStyle { |
| /// The macro statement had a trailing semicolon (e.g., `foo! { ... };` |
| /// `foo!(...);`, `foo![...];`). |
| Semicolon, |
| /// The macro statement had braces (e.g., `foo! { ... }`). |
| Braces, |
| /// The macro statement had parentheses or brackets and no semicolon (e.g., |
| /// `foo!(...)`). All of these will end up being converted into macro |
| /// expressions. |
| NoBraces, |
| } |
| |
| /// Local represents a `let` statement, e.g., `let <pat>:<ty> = <expr>;`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Local { |
| pub id: NodeId, |
| pub pat: P<Pat>, |
| pub ty: Option<P<Ty>>, |
| /// Initializer expression to set the value, if any. |
| pub init: Option<P<Expr>>, |
| pub span: Span, |
| pub attrs: ThinVec<Attribute>, |
| } |
| |
| /// An arm of a 'match'. |
| /// |
| /// E.g., `0..=10 => { println!("match!") }` as in |
| /// |
| /// ``` |
| /// match 123 { |
| /// 0..=10 => { println!("match!") }, |
| /// _ => { println!("no match!") }, |
| /// } |
| /// ``` |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Arm { |
| pub attrs: Vec<Attribute>, |
| /// Match arm pattern, e.g. `10` in `match foo { 10 => {}, _ => {} }` |
| pub pat: P<Pat>, |
| /// Match arm guard, e.g. `n > 10` in `match foo { n if n > 10 => {}, _ => {} }` |
| pub guard: Option<P<Expr>>, |
| /// Match arm body. |
| pub body: P<Expr>, |
| pub span: Span, |
| pub id: NodeId, |
| pub is_placeholder: bool, |
| } |
| |
| /// Access of a named (e.g., `obj.foo`) or unnamed (e.g., `obj.0`) struct field. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Field { |
| pub attrs: ThinVec<Attribute>, |
| pub id: NodeId, |
| pub span: Span, |
| pub ident: Ident, |
| pub expr: P<Expr>, |
| pub is_shorthand: bool, |
| pub is_placeholder: bool, |
| } |
| |
| #[derive(Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, Copy)] |
| pub enum BlockCheckMode { |
| Default, |
| Unsafe(UnsafeSource), |
| } |
| |
| #[derive(Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, Copy)] |
| pub enum UnsafeSource { |
| CompilerGenerated, |
| UserProvided, |
| } |
| |
| /// A constant (expression) that's not an item or associated item, |
| /// but needs its own `DefId` for type-checking, const-eval, etc. |
| /// These are usually found nested inside types (e.g., array lengths) |
| /// or expressions (e.g., repeat counts), and also used to define |
| /// explicit discriminant values for enum variants. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct AnonConst { |
| pub id: NodeId, |
| pub value: P<Expr>, |
| } |
| |
| /// An expression. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Expr { |
| pub id: NodeId, |
| pub kind: ExprKind, |
| pub span: Span, |
| pub attrs: ThinVec<Attribute>, |
| } |
| |
| // `Expr` is used a lot. Make sure it doesn't unintentionally get bigger. |
| #[cfg(target_arch = "x86_64")] |
| rustc_data_structures::static_assert_size!(Expr, 96); |
| |
| impl Expr { |
| /// Returns `true` if this expression would be valid somewhere that expects a value; |
| /// for example, an `if` condition. |
| pub fn returns(&self) -> bool { |
| if let ExprKind::Block(ref block, _) = self.kind { |
| match block.stmts.last().map(|last_stmt| &last_stmt.kind) { |
| // Implicit return |
| Some(&StmtKind::Expr(_)) => true, |
| Some(&StmtKind::Semi(ref expr)) => { |
| if let ExprKind::Ret(_) = expr.kind { |
| // Last statement is explicit return. |
| true |
| } else { |
| false |
| } |
| } |
| // This is a block that doesn't end in either an implicit or explicit return. |
| _ => false, |
| } |
| } else { |
| // This is not a block, it is a value. |
| true |
| } |
| } |
| |
| pub fn to_bound(&self) -> Option<GenericBound> { |
| match &self.kind { |
| ExprKind::Path(None, path) => Some(GenericBound::Trait( |
| PolyTraitRef::new(Vec::new(), path.clone(), self.span), |
| TraitBoundModifier::None, |
| )), |
| _ => None, |
| } |
| } |
| |
| /// Attempts to reparse as `Ty` (for diagnostic purposes). |
| pub fn to_ty(&self) -> Option<P<Ty>> { |
| let kind = match &self.kind { |
| // Trivial conversions. |
| ExprKind::Path(qself, path) => TyKind::Path(qself.clone(), path.clone()), |
| ExprKind::Mac(mac) => TyKind::Mac(mac.clone()), |
| |
| ExprKind::Paren(expr) => expr.to_ty().map(TyKind::Paren)?, |
| |
| ExprKind::AddrOf(BorrowKind::Ref, mutbl, expr) => expr |
| .to_ty() |
| .map(|ty| TyKind::Rptr(None, MutTy { ty, mutbl: *mutbl }))?, |
| |
| ExprKind::Repeat(expr, expr_len) => { |
| expr.to_ty().map(|ty| TyKind::Array(ty, expr_len.clone()))? |
| } |
| |
| ExprKind::Array(exprs) if exprs.len() == 1 => exprs[0].to_ty().map(TyKind::Slice)?, |
| |
| ExprKind::Tup(exprs) => { |
| let tys = exprs |
| .iter() |
| .map(|expr| expr.to_ty()) |
| .collect::<Option<Vec<_>>>()?; |
| TyKind::Tup(tys) |
| } |
| |
| // If binary operator is `Add` and both `lhs` and `rhs` are trait bounds, |
| // then type of result is trait object. |
| // Othewise we don't assume the result type. |
| ExprKind::Binary(binop, lhs, rhs) if binop.node == BinOpKind::Add => { |
| if let (Some(lhs), Some(rhs)) = (lhs.to_bound(), rhs.to_bound()) { |
| TyKind::TraitObject(vec![lhs, rhs], TraitObjectSyntax::None) |
| } else { |
| return None; |
| } |
| } |
| |
| // This expression doesn't look like a type syntactically. |
| _ => return None, |
| }; |
| |
| Some(P(Ty { |
| kind, |
| id: self.id, |
| span: self.span, |
| })) |
| } |
| |
| pub fn precedence(&self) -> ExprPrecedence { |
| match self.kind { |
| ExprKind::Box(_) => ExprPrecedence::Box, |
| ExprKind::Array(_) => ExprPrecedence::Array, |
| ExprKind::Call(..) => ExprPrecedence::Call, |
| ExprKind::MethodCall(..) => ExprPrecedence::MethodCall, |
| ExprKind::Tup(_) => ExprPrecedence::Tup, |
| ExprKind::Binary(op, ..) => ExprPrecedence::Binary(op.node), |
| ExprKind::Unary(..) => ExprPrecedence::Unary, |
| ExprKind::Lit(_) => ExprPrecedence::Lit, |
| ExprKind::Type(..) | ExprKind::Cast(..) => ExprPrecedence::Cast, |
| ExprKind::Let(..) => ExprPrecedence::Let, |
| ExprKind::If(..) => ExprPrecedence::If, |
| ExprKind::While(..) => ExprPrecedence::While, |
| ExprKind::ForLoop(..) => ExprPrecedence::ForLoop, |
| ExprKind::Loop(..) => ExprPrecedence::Loop, |
| ExprKind::Match(..) => ExprPrecedence::Match, |
| ExprKind::Closure(..) => ExprPrecedence::Closure, |
| ExprKind::Block(..) => ExprPrecedence::Block, |
| ExprKind::TryBlock(..) => ExprPrecedence::TryBlock, |
| ExprKind::Async(..) => ExprPrecedence::Async, |
| ExprKind::Await(..) => ExprPrecedence::Await, |
| ExprKind::Assign(..) => ExprPrecedence::Assign, |
| ExprKind::AssignOp(..) => ExprPrecedence::AssignOp, |
| ExprKind::Field(..) => ExprPrecedence::Field, |
| ExprKind::Index(..) => ExprPrecedence::Index, |
| ExprKind::Range(..) => ExprPrecedence::Range, |
| ExprKind::Path(..) => ExprPrecedence::Path, |
| ExprKind::AddrOf(..) => ExprPrecedence::AddrOf, |
| ExprKind::Break(..) => ExprPrecedence::Break, |
| ExprKind::Continue(..) => ExprPrecedence::Continue, |
| ExprKind::Ret(..) => ExprPrecedence::Ret, |
| ExprKind::InlineAsm(..) => ExprPrecedence::InlineAsm, |
| ExprKind::Mac(..) => ExprPrecedence::Mac, |
| ExprKind::Struct(..) => ExprPrecedence::Struct, |
| ExprKind::Repeat(..) => ExprPrecedence::Repeat, |
| ExprKind::Paren(..) => ExprPrecedence::Paren, |
| ExprKind::Try(..) => ExprPrecedence::Try, |
| ExprKind::Yield(..) => ExprPrecedence::Yield, |
| ExprKind::Err => ExprPrecedence::Err, |
| } |
| } |
| } |
| |
| /// Limit types of a range (inclusive or exclusive) |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug)] |
| pub enum RangeLimits { |
| /// Inclusive at the beginning, exclusive at the end |
| HalfOpen, |
| /// Inclusive at the beginning and end |
| Closed, |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum ExprKind { |
| /// A `box x` expression. |
| Box(P<Expr>), |
| /// An array (`[a, b, c, d]`) |
| Array(Vec<P<Expr>>), |
| /// A function call |
| /// |
| /// The first field resolves to the function itself, |
| /// and the second field is the list of arguments. |
| /// This also represents calling the constructor of |
| /// tuple-like ADTs such as tuple structs and enum variants. |
| Call(P<Expr>, Vec<P<Expr>>), |
| /// A method call (`x.foo::<'static, Bar, Baz>(a, b, c, d)`) |
| /// |
| /// The `PathSegment` represents the method name and its generic arguments |
| /// (within the angle brackets). |
| /// The first element of the vector of an `Expr` is the expression that evaluates |
| /// to the object on which the method is being called on (the receiver), |
| /// and the remaining elements are the rest of the arguments. |
| /// Thus, `x.foo::<Bar, Baz>(a, b, c, d)` is represented as |
| /// `ExprKind::MethodCall(PathSegment { foo, [Bar, Baz] }, [x, a, b, c, d])`. |
| MethodCall(PathSegment, Vec<P<Expr>>), |
| /// A tuple (e.g., `(a, b, c, d)`). |
| Tup(Vec<P<Expr>>), |
| /// A binary operation (e.g., `a + b`, `a * b`). |
| Binary(BinOp, P<Expr>, P<Expr>), |
| /// A unary operation (e.g., `!x`, `*x`). |
| Unary(UnOp, P<Expr>), |
| /// A literal (e.g., `1`, `"foo"`). |
| Lit(Lit), |
| /// A cast (e.g., `foo as f64`). |
| Cast(P<Expr>, P<Ty>), |
| /// A type ascription (e.g., `42: usize`). |
| Type(P<Expr>, P<Ty>), |
| /// A `let pat = expr` expression that is only semantically allowed in the condition |
| /// of `if` / `while` expressions. (e.g., `if let 0 = x { .. }`). |
| Let(P<Pat>, P<Expr>), |
| /// An `if` block, with an optional `else` block. |
| /// |
| /// `if expr { block } else { expr }` |
| If(P<Expr>, P<Block>, Option<P<Expr>>), |
| /// A while loop, with an optional label. |
| /// |
| /// `'label: while expr { block }` |
| While(P<Expr>, P<Block>, Option<Label>), |
| /// A `for` loop, with an optional label. |
| /// |
| /// `'label: for pat in expr { block }` |
| /// |
| /// This is desugared to a combination of `loop` and `match` expressions. |
| ForLoop(P<Pat>, P<Expr>, P<Block>, Option<Label>), |
| /// Conditionless loop (can be exited with `break`, `continue`, or `return`). |
| /// |
| /// `'label: loop { block }` |
| Loop(P<Block>, Option<Label>), |
| /// A `match` block. |
| Match(P<Expr>, Vec<Arm>), |
| /// A closure (e.g., `move |a, b, c| a + b + c`). |
| /// |
| /// The final span is the span of the argument block `|...|`. |
| Closure(CaptureBy, IsAsync, Movability, P<FnDecl>, P<Expr>, Span), |
| /// A block (`'label: { ... }`). |
| Block(P<Block>, Option<Label>), |
| /// An async block (`async move { ... }`). |
| /// |
| /// The `NodeId` is the `NodeId` for the closure that results from |
| /// desugaring an async block, just like the NodeId field in the |
| /// `IsAsync` enum. This is necessary in order to create a def for the |
| /// closure which can be used as a parent of any child defs. Defs |
| /// created during lowering cannot be made the parent of any other |
| /// preexisting defs. |
| Async(CaptureBy, NodeId, P<Block>), |
| /// An await expression (`my_future.await`). |
| Await(P<Expr>), |
| |
| /// A try block (`try { ... }`). |
| TryBlock(P<Block>), |
| |
| /// An assignment (`a = foo()`). |
| Assign(P<Expr>, P<Expr>), |
| /// An assignment with an operator. |
| /// |
| /// E.g., `a += 1`. |
| AssignOp(BinOp, P<Expr>, P<Expr>), |
| /// Access of a named (e.g., `obj.foo`) or unnamed (e.g., `obj.0`) struct field. |
| Field(P<Expr>, Ident), |
| /// An indexing operation (e.g., `foo[2]`). |
| Index(P<Expr>, P<Expr>), |
| /// A range (e.g., `1..2`, `1..`, `..2`, `1..=2`, `..=2`). |
| Range(Option<P<Expr>>, Option<P<Expr>>, RangeLimits), |
| |
| /// Variable reference, possibly containing `::` and/or type |
| /// parameters (e.g., `foo::bar::<baz>`). |
| /// |
| /// Optionally "qualified" (e.g., `<Vec<T> as SomeTrait>::SomeType`). |
| Path(Option<QSelf>, Path), |
| |
| /// A referencing operation (`&a`, `&mut a`, `&raw const a` or `&raw mut a`). |
| AddrOf(BorrowKind, Mutability, P<Expr>), |
| /// A `break`, with an optional label to break, and an optional expression. |
| Break(Option<Label>, Option<P<Expr>>), |
| /// A `continue`, with an optional label. |
| Continue(Option<Label>), |
| /// A `return`, with an optional value to be returned. |
| Ret(Option<P<Expr>>), |
| |
| /// Output of the `asm!()` macro. |
| InlineAsm(P<InlineAsm>), |
| |
| /// A macro invocation; pre-expansion. |
| Mac(Mac), |
| |
| /// A struct literal expression. |
| /// |
| /// E.g., `Foo {x: 1, y: 2}`, or `Foo {x: 1, .. base}`, |
| /// where `base` is the `Option<Expr>`. |
| Struct(Path, Vec<Field>, Option<P<Expr>>), |
| |
| /// An array literal constructed from one repeated element. |
| /// |
| /// E.g., `[1; 5]`. The expression is the element to be |
| /// repeated; the constant is the number of times to repeat it. |
| Repeat(P<Expr>, AnonConst), |
| |
| /// No-op: used solely so we can pretty-print faithfully. |
| Paren(P<Expr>), |
| |
| /// A try expression (`expr?`). |
| Try(P<Expr>), |
| |
| /// A `yield`, with an optional value to be yielded. |
| Yield(Option<P<Expr>>), |
| |
| /// Placeholder for an expression that wasn't syntactically well formed in some way. |
| Err, |
| } |
| |
| /// The explicit `Self` type in a "qualified path". The actual |
| /// path, including the trait and the associated item, is stored |
| /// separately. `position` represents the index of the associated |
| /// item qualified with this `Self` type. |
| /// |
| /// ```ignore (only-for-syntax-highlight) |
| /// <Vec<T> as a::b::Trait>::AssociatedItem |
| /// ^~~~~ ~~~~~~~~~~~~~~^ |
| /// ty position = 3 |
| /// |
| /// <Vec<T>>::AssociatedItem |
| /// ^~~~~ ^ |
| /// ty position = 0 |
| /// ``` |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct QSelf { |
| pub ty: P<Ty>, |
| |
| /// The span of `a::b::Trait` in a path like `<Vec<T> as |
| /// a::b::Trait>::AssociatedItem`; in the case where `position == |
| /// 0`, this is an empty span. |
| pub path_span: Span, |
| pub position: usize, |
| } |
| |
| /// A capture clause used in closures and `async` blocks. |
| #[derive(Clone, Copy, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum CaptureBy { |
| /// `move |x| y + x`. |
| Value, |
| /// `move` keyword was not specified. |
| Ref, |
| } |
| |
| /// The movability of a generator / closure literal: |
| /// whether a generator contains self-references, causing it to be `!Unpin`. |
| #[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, |
| RustcEncodable, RustcDecodable, Debug, Copy, HashStable_Generic)] |
| pub enum Movability { |
| /// May contain self-references, `!Unpin`. |
| Static, |
| /// Must not contain self-references, `Unpin`. |
| Movable, |
| } |
| |
| /// Represents a macro invocation. The `path` indicates which macro |
| /// is being invoked, and the `args` are arguments passed to it. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Mac { |
| pub path: Path, |
| pub args: P<MacArgs>, |
| pub prior_type_ascription: Option<(Span, bool)>, |
| } |
| |
| impl Mac { |
| pub fn span(&self) -> Span { |
| self.path.span.to(self.args.span().unwrap_or(self.path.span)) |
| } |
| } |
| |
| /// Arguments passed to an attribute or a function-like macro. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum MacArgs { |
| /// No arguments - `#[attr]`. |
| Empty, |
| /// Delimited arguments - `#[attr()/[]/{}]` or `mac!()/[]/{}`. |
| Delimited(DelimSpan, MacDelimiter, TokenStream), |
| /// Arguments of a key-value attribute - `#[attr = "value"]`. |
| Eq( |
| /// Span of the `=` token. |
| Span, |
| /// Token stream of the "value". |
| TokenStream, |
| ), |
| } |
| |
| impl MacArgs { |
| pub fn delim(&self) -> DelimToken { |
| match self { |
| MacArgs::Delimited(_, delim, _) => delim.to_token(), |
| MacArgs::Empty | MacArgs::Eq(..) => token::NoDelim, |
| } |
| } |
| |
| pub fn span(&self) -> Option<Span> { |
| match *self { |
| MacArgs::Empty => None, |
| MacArgs::Delimited(dspan, ..) => Some(dspan.entire()), |
| MacArgs::Eq(eq_span, ref tokens) => Some(eq_span.to(tokens.span().unwrap_or(eq_span))), |
| } |
| } |
| |
| /// Tokens inside the delimiters or after `=`. |
| /// Proc macros see these tokens, for example. |
| pub fn inner_tokens(&self) -> TokenStream { |
| match self { |
| MacArgs::Empty => TokenStream::default(), |
| MacArgs::Delimited(.., tokens) | |
| MacArgs::Eq(.., tokens) => tokens.clone(), |
| } |
| } |
| |
| /// Tokens together with the delimiters or `=`. |
| /// Use of this method generally means that something suboptimal or hacky is happening. |
| pub fn outer_tokens(&self) -> TokenStream { |
| match *self { |
| MacArgs::Empty => TokenStream::default(), |
| MacArgs::Delimited(dspan, delim, ref tokens) => |
| TokenTree::Delimited(dspan, delim.to_token(), tokens.clone()).into(), |
| MacArgs::Eq(eq_span, ref tokens) => iter::once(TokenTree::token(token::Eq, eq_span)) |
| .chain(tokens.trees()).collect(), |
| } |
| } |
| |
| /// Whether a macro with these arguments needs a semicolon |
| /// when used as a standalone item or statement. |
| pub fn need_semicolon(&self) -> bool { |
| !matches!(self, MacArgs::Delimited(_, MacDelimiter::Brace ,_)) |
| } |
| } |
| |
| #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum MacDelimiter { |
| Parenthesis, |
| Bracket, |
| Brace, |
| } |
| |
| impl MacDelimiter { |
| crate fn to_token(self) -> DelimToken { |
| match self { |
| MacDelimiter::Parenthesis => DelimToken::Paren, |
| MacDelimiter::Bracket => DelimToken::Bracket, |
| MacDelimiter::Brace => DelimToken::Brace, |
| } |
| } |
| |
| pub fn from_token(delim: DelimToken) -> Option<MacDelimiter> { |
| match delim { |
| token::Paren => Some(MacDelimiter::Parenthesis), |
| token::Bracket => Some(MacDelimiter::Bracket), |
| token::Brace => Some(MacDelimiter::Brace), |
| token::NoDelim => None, |
| } |
| } |
| } |
| |
| /// Represents a macro definition. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct MacroDef { |
| pub body: P<MacArgs>, |
| /// `true` if macro was defined with `macro_rules`. |
| pub legacy: bool, |
| } |
| |
| // Clippy uses Hash and PartialEq |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug, Copy, Hash, PartialEq, HashStable_Generic)] |
| pub enum StrStyle { |
| /// A regular string, like `"foo"`. |
| Cooked, |
| /// A raw string, like `r##"foo"##`. |
| /// |
| /// The value is the number of `#` symbols used. |
| Raw(u16), |
| } |
| |
| /// An AST literal. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct Lit { |
| /// The original literal token as written in source code. |
| pub token: token::Lit, |
| /// The "semantic" representation of the literal lowered from the original tokens. |
| /// Strings are unescaped, hexadecimal forms are eliminated, etc. |
| /// FIXME: Remove this and only create the semantic representation during lowering to HIR. |
| pub kind: LitKind, |
| pub span: Span, |
| } |
| |
| /// Same as `Lit`, but restricted to string literals. |
| #[derive(Clone, Copy, RustcEncodable, RustcDecodable, Debug)] |
| pub struct StrLit { |
| /// The original literal token as written in source code. |
| pub style: StrStyle, |
| pub symbol: Symbol, |
| pub suffix: Option<Symbol>, |
| pub span: Span, |
| /// The unescaped "semantic" representation of the literal lowered from the original token. |
| /// FIXME: Remove this and only create the semantic representation during lowering to HIR. |
| pub symbol_unescaped: Symbol, |
| } |
| |
| impl StrLit { |
| crate fn as_lit(&self) -> Lit { |
| let token_kind = match self.style { |
| StrStyle::Cooked => token::Str, |
| StrStyle::Raw(n) => token::StrRaw(n), |
| }; |
| Lit { |
| token: token::Lit::new(token_kind, self.symbol, self.suffix), |
| span: self.span, |
| kind: LitKind::Str(self.symbol_unescaped, self.style), |
| } |
| } |
| } |
| |
| // Clippy uses Hash and PartialEq |
| /// Type of the integer literal based on provided suffix. |
| #[derive(Clone, Copy, RustcEncodable, RustcDecodable, Debug, Hash, PartialEq, HashStable_Generic)] |
| pub enum LitIntType { |
| /// e.g. `42_i32`. |
| Signed(IntTy), |
| /// e.g. `42_u32`. |
| Unsigned(UintTy), |
| /// e.g. `42`. |
| Unsuffixed, |
| } |
| |
| /// Type of the float literal based on provided suffix. |
| #[derive(Clone, Copy, RustcEncodable, RustcDecodable, Debug, Hash, PartialEq, HashStable_Generic)] |
| pub enum LitFloatType { |
| /// A float literal with a suffix (`1f32` or `1E10f32`). |
| Suffixed(FloatTy), |
| /// A float literal without a suffix (`1.0 or 1.0E10`). |
| Unsuffixed, |
| } |
| |
| /// Literal kind. |
| /// |
| /// E.g., `"foo"`, `42`, `12.34`, or `bool`. |
| // Clippy uses Hash and PartialEq |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug, Hash, PartialEq, HashStable_Generic)] |
| pub enum LitKind { |
| /// A string literal (`"foo"`). |
| Str(Symbol, StrStyle), |
| /// A byte string (`b"foo"`). |
| ByteStr(Lrc<Vec<u8>>), |
| /// A byte char (`b'f'`). |
| Byte(u8), |
| /// A character literal (`'a'`). |
| Char(char), |
| /// An integer literal (`1`). |
| Int(u128, LitIntType), |
| /// A float literal (`1f64` or `1E10f64`). |
| Float(Symbol, LitFloatType), |
| /// A boolean literal. |
| Bool(bool), |
| /// Placeholder for a literal that wasn't well-formed in some way. |
| Err(Symbol), |
| } |
| |
| impl LitKind { |
| /// Returns `true` if this literal is a string. |
| pub fn is_str(&self) -> bool { |
| match *self { |
| LitKind::Str(..) => true, |
| _ => false, |
| } |
| } |
| |
| /// Returns `true` if this literal is byte literal string. |
| pub fn is_bytestr(&self) -> bool { |
| match self { |
| LitKind::ByteStr(_) => true, |
| _ => false, |
| } |
| } |
| |
| /// Returns `true` if this is a numeric literal. |
| pub fn is_numeric(&self) -> bool { |
| match *self { |
| LitKind::Int(..) | LitKind::Float(..) => true, |
| _ => false, |
| } |
| } |
| |
| /// Returns `true` if this literal has no suffix. |
| /// Note: this will return true for literals with prefixes such as raw strings and byte strings. |
| pub fn is_unsuffixed(&self) -> bool { |
| !self.is_suffixed() |
| } |
| |
| /// Returns `true` if this literal has a suffix. |
| pub fn is_suffixed(&self) -> bool { |
| match *self { |
| // suffixed variants |
| LitKind::Int(_, LitIntType::Signed(..)) |
| | LitKind::Int(_, LitIntType::Unsigned(..)) |
| | LitKind::Float(_, LitFloatType::Suffixed(..)) => true, |
| // unsuffixed variants |
| LitKind::Str(..) |
| | LitKind::ByteStr(..) |
| | LitKind::Byte(..) |
| | LitKind::Char(..) |
| | LitKind::Int(_, LitIntType::Unsuffixed) |
| | LitKind::Float(_, LitFloatType::Unsuffixed) |
| | LitKind::Bool(..) |
| | LitKind::Err(..) => false, |
| } |
| } |
| } |
| |
| // N.B., If you change this, you'll probably want to change the corresponding |
| // type structure in `middle/ty.rs` as well. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct MutTy { |
| pub ty: P<Ty>, |
| pub mutbl: Mutability, |
| } |
| |
| /// Represents a function's signature in a trait declaration, |
| /// trait implementation, or free function. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct FnSig { |
| pub header: FnHeader, |
| pub decl: P<FnDecl>, |
| } |
| |
| /// Represents an item declaration within a trait declaration, |
| /// possibly including a default implementation. A trait item is |
| /// either required (meaning it doesn't have an implementation, just a |
| /// signature) or provided (meaning it has a default implementation). |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct TraitItem { |
| pub attrs: Vec<Attribute>, |
| pub id: NodeId, |
| pub span: Span, |
| pub vis: Visibility, |
| pub ident: Ident, |
| |
| pub generics: Generics, |
| pub kind: TraitItemKind, |
| /// See `Item::tokens` for what this is. |
| pub tokens: Option<TokenStream>, |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum TraitItemKind { |
| Const(P<Ty>, Option<P<Expr>>), |
| Method(FnSig, Option<P<Block>>), |
| Type(GenericBounds, Option<P<Ty>>), |
| Macro(Mac), |
| } |
| |
| /// Represents anything within an `impl` block. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct ImplItem { |
| pub attrs: Vec<Attribute>, |
| pub id: NodeId, |
| pub span: Span, |
| pub vis: Visibility, |
| pub ident: Ident, |
| |
| pub defaultness: Defaultness, |
| pub generics: Generics, |
| pub kind: ImplItemKind, |
| /// See `Item::tokens` for what this is. |
| pub tokens: Option<TokenStream>, |
| } |
| |
| /// Represents various kinds of content within an `impl`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum ImplItemKind { |
| Const(P<Ty>, P<Expr>), |
| Method(FnSig, P<Block>), |
| TyAlias(P<Ty>), |
| Macro(Mac), |
| } |
| |
| #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, HashStable_Generic, |
| RustcEncodable, RustcDecodable, Debug)] |
| pub enum FloatTy { |
| F32, |
| F64, |
| } |
| |
| impl FloatTy { |
| pub fn name_str(self) -> &'static str { |
| match self { |
| FloatTy::F32 => "f32", |
| FloatTy::F64 => "f64", |
| } |
| } |
| |
| pub fn name(self) -> Symbol { |
| match self { |
| FloatTy::F32 => sym::f32, |
| FloatTy::F64 => sym::f64, |
| } |
| } |
| |
| pub fn bit_width(self) -> usize { |
| match self { |
| FloatTy::F32 => 32, |
| FloatTy::F64 => 64, |
| } |
| } |
| } |
| |
| #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, HashStable_Generic, |
| RustcEncodable, RustcDecodable, Debug)] |
| pub enum IntTy { |
| Isize, |
| I8, |
| I16, |
| I32, |
| I64, |
| I128, |
| } |
| |
| impl IntTy { |
| pub fn name_str(&self) -> &'static str { |
| match *self { |
| IntTy::Isize => "isize", |
| IntTy::I8 => "i8", |
| IntTy::I16 => "i16", |
| IntTy::I32 => "i32", |
| IntTy::I64 => "i64", |
| IntTy::I128 => "i128", |
| } |
| } |
| |
| pub fn name(&self) -> Symbol { |
| match *self { |
| IntTy::Isize => sym::isize, |
| IntTy::I8 => sym::i8, |
| IntTy::I16 => sym::i16, |
| IntTy::I32 => sym::i32, |
| IntTy::I64 => sym::i64, |
| IntTy::I128 => sym::i128, |
| } |
| } |
| |
| pub fn val_to_string(&self, val: i128) -> String { |
| // Cast to a `u128` so we can correctly print `INT128_MIN`. All integral types |
| // are parsed as `u128`, so we wouldn't want to print an extra negative |
| // sign. |
| format!("{}{}", val as u128, self.name_str()) |
| } |
| |
| pub fn bit_width(&self) -> Option<usize> { |
| Some(match *self { |
| IntTy::Isize => return None, |
| IntTy::I8 => 8, |
| IntTy::I16 => 16, |
| IntTy::I32 => 32, |
| IntTy::I64 => 64, |
| IntTy::I128 => 128, |
| }) |
| } |
| |
| pub fn normalize(&self, target_width: u32) -> Self { |
| match self { |
| IntTy::Isize => match target_width { |
| 16 => IntTy::I16, |
| 32 => IntTy::I32, |
| 64 => IntTy::I64, |
| _ => unreachable!(), |
| }, |
| _ => *self, |
| } |
| } |
| } |
| |
| #[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, HashStable_Generic, |
| RustcEncodable, RustcDecodable, Copy, Debug)] |
| pub enum UintTy { |
| Usize, |
| U8, |
| U16, |
| U32, |
| U64, |
| U128, |
| } |
| |
| impl UintTy { |
| pub fn name_str(&self) -> &'static str { |
| match *self { |
| UintTy::Usize => "usize", |
| UintTy::U8 => "u8", |
| UintTy::U16 => "u16", |
| UintTy::U32 => "u32", |
| UintTy::U64 => "u64", |
| UintTy::U128 => "u128", |
| } |
| } |
| |
| pub fn name(&self) -> Symbol { |
| match *self { |
| UintTy::Usize => sym::usize, |
| UintTy::U8 => sym::u8, |
| UintTy::U16 => sym::u16, |
| UintTy::U32 => sym::u32, |
| UintTy::U64 => sym::u64, |
| UintTy::U128 => sym::u128, |
| } |
| } |
| |
| pub fn val_to_string(&self, val: u128) -> String { |
| format!("{}{}", val, self.name_str()) |
| } |
| |
| pub fn bit_width(&self) -> Option<usize> { |
| Some(match *self { |
| UintTy::Usize => return None, |
| UintTy::U8 => 8, |
| UintTy::U16 => 16, |
| UintTy::U32 => 32, |
| UintTy::U64 => 64, |
| UintTy::U128 => 128, |
| }) |
| } |
| |
| pub fn normalize(&self, target_width: u32) -> Self { |
| match self { |
| UintTy::Usize => match target_width { |
| 16 => UintTy::U16, |
| 32 => UintTy::U32, |
| 64 => UintTy::U64, |
| _ => unreachable!(), |
| }, |
| _ => *self, |
| } |
| } |
| } |
| |
| /// A constraint on an associated type (e.g., `A = Bar` in `Foo<A = Bar>` or |
| /// `A: TraitA + TraitB` in `Foo<A: TraitA + TraitB>`). |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct AssocTyConstraint { |
| pub id: NodeId, |
| pub ident: Ident, |
| pub kind: AssocTyConstraintKind, |
| pub span: Span, |
| } |
| |
| /// The kinds of an `AssocTyConstraint`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum AssocTyConstraintKind { |
| /// E.g., `A = Bar` in `Foo<A = Bar>`. |
| Equality { |
| ty: P<Ty>, |
| }, |
| /// E.g. `A: TraitA + TraitB` in `Foo<A: TraitA + TraitB>`. |
| Bound { |
| bounds: GenericBounds, |
| }, |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Ty { |
| pub id: NodeId, |
| pub kind: TyKind, |
| pub span: Span, |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct BareFnTy { |
| pub unsafety: Unsafety, |
| pub ext: Extern, |
| pub generic_params: Vec<GenericParam>, |
| pub decl: P<FnDecl>, |
| } |
| |
| /// The various kinds of type recognized by the compiler. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum TyKind { |
| /// A variable-length slice (`[T]`). |
| Slice(P<Ty>), |
| /// A fixed length array (`[T; n]`). |
| Array(P<Ty>, AnonConst), |
| /// A raw pointer (`*const T` or `*mut T`). |
| Ptr(MutTy), |
| /// A reference (`&'a T` or `&'a mut T`). |
| Rptr(Option<Lifetime>, MutTy), |
| /// A bare function (e.g., `fn(usize) -> bool`). |
| BareFn(P<BareFnTy>), |
| /// The never type (`!`). |
| Never, |
| /// A tuple (`(A, B, C, D,...)`). |
| Tup(Vec<P<Ty>>), |
| /// A path (`module::module::...::Type`), optionally |
| /// "qualified", e.g., `<Vec<T> as SomeTrait>::SomeType`. |
| /// |
| /// Type parameters are stored in the `Path` itself. |
| Path(Option<QSelf>, Path), |
| /// A trait object type `Bound1 + Bound2 + Bound3` |
| /// where `Bound` is a trait or a lifetime. |
| TraitObject(GenericBounds, TraitObjectSyntax), |
| /// An `impl Bound1 + Bound2 + Bound3` type |
| /// where `Bound` is a trait or a lifetime. |
| /// |
| /// The `NodeId` exists to prevent lowering from having to |
| /// generate `NodeId`s on the fly, which would complicate |
| /// the generation of opaque `type Foo = impl Trait` items significantly. |
| ImplTrait(NodeId, GenericBounds), |
| /// No-op; kept solely so that we can pretty-print faithfully. |
| Paren(P<Ty>), |
| /// Unused for now. |
| Typeof(AnonConst), |
| /// This means the type should be inferred instead of it having been |
| /// specified. This can appear anywhere in a type. |
| Infer, |
| /// Inferred type of a `self` or `&self` argument in a method. |
| ImplicitSelf, |
| /// A macro in the type position. |
| Mac(Mac), |
| /// Placeholder for a kind that has failed to be defined. |
| Err, |
| /// Placeholder for a `va_list`. |
| CVarArgs, |
| } |
| |
| impl TyKind { |
| pub fn is_implicit_self(&self) -> bool { |
| if let TyKind::ImplicitSelf = *self { |
| true |
| } else { |
| false |
| } |
| } |
| |
| pub fn is_unit(&self) -> bool { |
| if let TyKind::Tup(ref tys) = *self { |
| tys.is_empty() |
| } else { |
| false |
| } |
| } |
| |
| /// HACK(type_alias_impl_trait, Centril): A temporary crutch used |
| /// in lowering to avoid making larger changes there and beyond. |
| pub fn opaque_top_hack(&self) -> Option<&GenericBounds> { |
| match self { |
| Self::ImplTrait(_, bounds) => Some(bounds), |
| _ => None, |
| } |
| } |
| } |
| |
| /// Syntax used to declare a trait object. |
| #[derive(Clone, Copy, PartialEq, RustcEncodable, RustcDecodable, Debug)] |
| pub enum TraitObjectSyntax { |
| Dyn, |
| None, |
| } |
| |
| /// Inline assembly dialect. |
| /// |
| /// E.g., `"intel"` as in `asm!("mov eax, 2" : "={eax}"(result) : : : "intel")`. |
| #[derive(Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, Copy, HashStable_Generic)] |
| pub enum AsmDialect { |
| Att, |
| Intel, |
| } |
| |
| /// Inline assembly. |
| /// |
| /// E.g., `"={eax}"(result)` as in `asm!("mov eax, 2" : "={eax}"(result) : : : "intel")`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct InlineAsmOutput { |
| pub constraint: Symbol, |
| pub expr: P<Expr>, |
| pub is_rw: bool, |
| pub is_indirect: bool, |
| } |
| |
| /// Inline assembly. |
| /// |
| /// E.g., `asm!("NOP");`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct InlineAsm { |
| pub asm: Symbol, |
| pub asm_str_style: StrStyle, |
| pub outputs: Vec<InlineAsmOutput>, |
| pub inputs: Vec<(Symbol, P<Expr>)>, |
| pub clobbers: Vec<Symbol>, |
| pub volatile: bool, |
| pub alignstack: bool, |
| pub dialect: AsmDialect, |
| } |
| |
| /// A parameter in a function header. |
| /// |
| /// E.g., `bar: usize` as in `fn foo(bar: usize)`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Param { |
| pub attrs: ThinVec<Attribute>, |
| pub ty: P<Ty>, |
| pub pat: P<Pat>, |
| pub id: NodeId, |
| pub span: Span, |
| pub is_placeholder: bool, |
| } |
| |
| /// Alternative representation for `Arg`s describing `self` parameter of methods. |
| /// |
| /// E.g., `&mut self` as in `fn foo(&mut self)`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum SelfKind { |
| /// `self`, `mut self` |
| Value(Mutability), |
| /// `&'lt self`, `&'lt mut self` |
| Region(Option<Lifetime>, Mutability), |
| /// `self: TYPE`, `mut self: TYPE` |
| Explicit(P<Ty>, Mutability), |
| } |
| |
| pub type ExplicitSelf = Spanned<SelfKind>; |
| |
| impl Param { |
| /// Attempts to cast parameter to `ExplicitSelf`. |
| pub fn to_self(&self) -> Option<ExplicitSelf> { |
| if let PatKind::Ident(BindingMode::ByValue(mutbl), ident, _) = self.pat.kind { |
| if ident.name == kw::SelfLower { |
| return match self.ty.kind { |
| TyKind::ImplicitSelf => Some(respan(self.pat.span, SelfKind::Value(mutbl))), |
| TyKind::Rptr(lt, MutTy { ref ty, mutbl }) if ty.kind.is_implicit_self() => { |
| Some(respan(self.pat.span, SelfKind::Region(lt, mutbl))) |
| } |
| _ => Some(respan( |
| self.pat.span.to(self.ty.span), |
| SelfKind::Explicit(self.ty.clone(), mutbl), |
| )), |
| }; |
| } |
| } |
| None |
| } |
| |
| /// Returns `true` if parameter is `self`. |
| pub fn is_self(&self) -> bool { |
| if let PatKind::Ident(_, ident, _) = self.pat.kind { |
| ident.name == kw::SelfLower |
| } else { |
| false |
| } |
| } |
| |
| /// Builds a `Param` object from `ExplicitSelf`. |
| pub fn from_self(attrs: ThinVec<Attribute>, eself: ExplicitSelf, eself_ident: Ident) -> Param { |
| let span = eself.span.to(eself_ident.span); |
| let infer_ty = P(Ty { |
| id: DUMMY_NODE_ID, |
| kind: TyKind::ImplicitSelf, |
| span, |
| }); |
| let param = |mutbl, ty| Param { |
| attrs, |
| pat: P(Pat { |
| id: DUMMY_NODE_ID, |
| kind: PatKind::Ident(BindingMode::ByValue(mutbl), eself_ident, None), |
| span, |
| }), |
| span, |
| ty, |
| id: DUMMY_NODE_ID, |
| is_placeholder: false |
| }; |
| match eself.node { |
| SelfKind::Explicit(ty, mutbl) => param(mutbl, ty), |
| SelfKind::Value(mutbl) => param(mutbl, infer_ty), |
| SelfKind::Region(lt, mutbl) => param( |
| Mutability::Immutable, |
| P(Ty { |
| id: DUMMY_NODE_ID, |
| kind: TyKind::Rptr( |
| lt, |
| MutTy { |
| ty: infer_ty, |
| mutbl, |
| }, |
| ), |
| span, |
| }), |
| ), |
| } |
| } |
| } |
| |
| /// A signature (not the body) of a function declaration. |
| /// |
| /// E.g., `fn foo(bar: baz)`. |
| /// |
| /// Please note that it's different from `FnHeader` structure |
| /// which contains metadata about function safety, asyncness, constness and ABI. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct FnDecl { |
| pub inputs: Vec<Param>, |
| pub output: FunctionRetTy, |
| } |
| |
| impl FnDecl { |
| pub fn get_self(&self) -> Option<ExplicitSelf> { |
| self.inputs.get(0).and_then(Param::to_self) |
| } |
| pub fn has_self(&self) -> bool { |
| self.inputs.get(0).map_or(false, Param::is_self) |
| } |
| pub fn c_variadic(&self) -> bool { |
| self.inputs.last().map_or(false, |arg| match arg.ty.kind { |
| TyKind::CVarArgs => true, |
| _ => false, |
| }) |
| } |
| } |
| |
| /// Is the trait definition an auto trait? |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum IsAuto { |
| Yes, |
| No, |
| } |
| |
| #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, |
| RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum Unsafety { |
| Unsafe, |
| Normal, |
| } |
| |
| impl Unsafety { |
| pub fn prefix_str(&self) -> &'static str { |
| match self { |
| Unsafety::Unsafe => "unsafe ", |
| Unsafety::Normal => "", |
| } |
| } |
| } |
| |
| impl fmt::Display for Unsafety { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| fmt::Display::fmt( |
| match *self { |
| Unsafety::Normal => "normal", |
| Unsafety::Unsafe => "unsafe", |
| }, |
| f, |
| ) |
| } |
| } |
| |
| #[derive(Copy, Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum IsAsync { |
| Async { |
| closure_id: NodeId, |
| return_impl_trait_id: NodeId, |
| }, |
| NotAsync, |
| } |
| |
| impl IsAsync { |
| pub fn is_async(self) -> bool { |
| if let IsAsync::Async { .. } = self { |
| true |
| } else { |
| false |
| } |
| } |
| |
| /// In ths case this is an `async` return, the `NodeId` for the generated `impl Trait` item. |
| pub fn opt_return_id(self) -> Option<NodeId> { |
| match self { |
| IsAsync::Async { |
| return_impl_trait_id, |
| .. |
| } => Some(return_impl_trait_id), |
| IsAsync::NotAsync => None, |
| } |
| } |
| } |
| |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum Constness { |
| Const, |
| NotConst, |
| } |
| |
| /// Item defaultness. |
| /// For details see the [RFC #2532](https://github.com/rust-lang/rfcs/pull/2532). |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum Defaultness { |
| Default, |
| Final, |
| } |
| |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, HashStable_Generic)] |
| pub enum ImplPolarity { |
| /// `impl Trait for Type` |
| Positive, |
| /// `impl !Trait for Type` |
| Negative, |
| } |
| |
| impl fmt::Debug for ImplPolarity { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| match *self { |
| ImplPolarity::Positive => "positive".fmt(f), |
| ImplPolarity::Negative => "negative".fmt(f), |
| } |
| } |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum FunctionRetTy { |
| /// Returns type is not specified. |
| /// |
| /// Functions default to `()` and closures default to inference. |
| /// Span points to where return type would be inserted. |
| Default(Span), |
| /// Everything else. |
| Ty(P<Ty>), |
| } |
| |
| impl FunctionRetTy { |
| pub fn span(&self) -> Span { |
| match *self { |
| FunctionRetTy::Default(span) => span, |
| FunctionRetTy::Ty(ref ty) => ty.span, |
| } |
| } |
| } |
| |
| /// Module declaration. |
| /// |
| /// E.g., `mod foo;` or `mod foo { .. }`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Mod { |
| /// A span from the first token past `{` to the last token until `}`. |
| /// For `mod foo;`, the inner span ranges from the first token |
| /// to the last token in the external file. |
| pub inner: Span, |
| pub items: Vec<P<Item>>, |
| /// `true` for `mod foo { .. }`; `false` for `mod foo;`. |
| pub inline: bool, |
| } |
| |
| /// Foreign module declaration. |
| /// |
| /// E.g., `extern { .. }` or `extern C { .. }`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct ForeignMod { |
| pub abi: Option<StrLit>, |
| pub items: Vec<ForeignItem>, |
| } |
| |
| /// Global inline assembly. |
| /// |
| /// Also known as "module-level assembly" or "file-scoped assembly". |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug, Copy)] |
| pub struct GlobalAsm { |
| pub asm: Symbol, |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct EnumDef { |
| pub variants: Vec<Variant>, |
| } |
| /// Enum variant. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Variant { |
| /// Attributes of the variant. |
| pub attrs: Vec<Attribute>, |
| /// Id of the variant (not the constructor, see `VariantData::ctor_id()`). |
| pub id: NodeId, |
| /// Span |
| pub span: Span, |
| /// The visibility of the variant. Syntactically accepted but not semantically. |
| pub vis: Visibility, |
| /// Name of the variant. |
| pub ident: Ident, |
| |
| /// Fields and constructor id of the variant. |
| pub data: VariantData, |
| /// Explicit discriminant, e.g., `Foo = 1`. |
| pub disr_expr: Option<AnonConst>, |
| /// Is a macro placeholder |
| pub is_placeholder: bool, |
| } |
| |
| /// Part of `use` item to the right of its prefix. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum UseTreeKind { |
| /// `use prefix` or `use prefix as rename` |
| /// |
| /// The extra `NodeId`s are for HIR lowering, when additional statements are created for each |
| /// namespace. |
| Simple(Option<Ident>, NodeId, NodeId), |
| /// `use prefix::{...}` |
| Nested(Vec<(UseTree, NodeId)>), |
| /// `use prefix::*` |
| Glob, |
| } |
| |
| /// A tree of paths sharing common prefixes. |
| /// Used in `use` items both at top-level and inside of braces in import groups. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct UseTree { |
| pub prefix: Path, |
| pub kind: UseTreeKind, |
| pub span: Span, |
| } |
| |
| impl UseTree { |
| pub fn ident(&self) -> Ident { |
| match self.kind { |
| UseTreeKind::Simple(Some(rename), ..) => rename, |
| UseTreeKind::Simple(None, ..) => { |
| self.prefix |
| .segments |
| .last() |
| .expect("empty prefix in a simple import") |
| .ident |
| } |
| _ => panic!("`UseTree::ident` can only be used on a simple import"), |
| } |
| } |
| } |
| |
| /// Distinguishes between `Attribute`s that decorate items and Attributes that |
| /// are contained as statements within items. These two cases need to be |
| /// distinguished for pretty-printing. |
| #[derive(Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, Copy, HashStable_Generic)] |
| pub enum AttrStyle { |
| Outer, |
| Inner, |
| } |
| |
| #[derive(Clone, PartialEq, Eq, Hash, Debug, PartialOrd, Ord, Copy)] |
| pub struct AttrId(pub usize); |
| |
| impl Idx for AttrId { |
| fn new(idx: usize) -> Self { |
| AttrId(idx) |
| } |
| fn index(self) -> usize { |
| self.0 |
| } |
| } |
| |
| impl rustc_serialize::Encodable for AttrId { |
| fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> { |
| s.emit_unit() |
| } |
| } |
| |
| impl rustc_serialize::Decodable for AttrId { |
| fn decode<D: Decoder>(d: &mut D) -> Result<AttrId, D::Error> { |
| d.read_nil().map(|_| crate::attr::mk_attr_id()) |
| } |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct AttrItem { |
| pub path: Path, |
| pub args: MacArgs, |
| } |
| |
| /// Metadata associated with an item. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Attribute { |
| pub kind: AttrKind, |
| pub id: AttrId, |
| /// Denotes if the attribute decorates the following construct (outer) |
| /// or the construct this attribute is contained within (inner). |
| pub style: AttrStyle, |
| pub span: Span, |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum AttrKind { |
| /// A normal attribute. |
| Normal(AttrItem), |
| |
| /// A doc comment (e.g. `/// ...`, `//! ...`, `/** ... */`, `/*! ... */`). |
| /// Doc attributes (e.g. `#[doc="..."]`) are represented with the `Normal` |
| /// variant (which is much less compact and thus more expensive). |
| /// |
| /// Note: `self.has_name(sym::doc)` and `self.check_name(sym::doc)` succeed |
| /// for this variant, but this may change in the future. |
| /// ``` |
| DocComment(Symbol), |
| } |
| |
| /// `TraitRef`s appear in impls. |
| /// |
| /// Resolution maps each `TraitRef`'s `ref_id` to its defining trait; that's all |
| /// that the `ref_id` is for. The `impl_id` maps to the "self type" of this impl. |
| /// If this impl is an `ItemKind::Impl`, the `impl_id` is redundant (it could be the |
| /// same as the impl's `NodeId`). |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct TraitRef { |
| pub path: Path, |
| pub ref_id: NodeId, |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct PolyTraitRef { |
| /// The `'a` in `<'a> Foo<&'a T>`. |
| pub bound_generic_params: Vec<GenericParam>, |
| |
| /// The `Foo<&'a T>` in `<'a> Foo<&'a T>`. |
| pub trait_ref: TraitRef, |
| |
| pub span: Span, |
| } |
| |
| impl PolyTraitRef { |
| pub fn new(generic_params: Vec<GenericParam>, path: Path, span: Span) -> Self { |
| PolyTraitRef { |
| bound_generic_params: generic_params, |
| trait_ref: TraitRef { |
| path, |
| ref_id: DUMMY_NODE_ID, |
| }, |
| span, |
| } |
| } |
| } |
| |
| #[derive(Copy, Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum CrateSugar { |
| /// Source is `pub(crate)`. |
| PubCrate, |
| |
| /// Source is (just) `crate`. |
| JustCrate, |
| } |
| |
| pub type Visibility = Spanned<VisibilityKind>; |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum VisibilityKind { |
| Public, |
| Crate(CrateSugar), |
| Restricted { path: P<Path>, id: NodeId }, |
| Inherited, |
| } |
| |
| impl VisibilityKind { |
| pub fn is_pub(&self) -> bool { |
| if let VisibilityKind::Public = *self { |
| true |
| } else { |
| false |
| } |
| } |
| } |
| |
| /// Field of a struct. |
| /// |
| /// E.g., `bar: usize` as in `struct Foo { bar: usize }`. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct StructField { |
| pub attrs: Vec<Attribute>, |
| pub id: NodeId, |
| pub span: Span, |
| pub vis: Visibility, |
| pub ident: Option<Ident>, |
| |
| pub ty: P<Ty>, |
| pub is_placeholder: bool, |
| } |
| |
| /// Fields and constructor ids of enum variants and structs. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum VariantData { |
| /// Struct variant. |
| /// |
| /// E.g., `Bar { .. }` as in `enum Foo { Bar { .. } }`. |
| Struct(Vec<StructField>, bool), |
| /// Tuple variant. |
| /// |
| /// E.g., `Bar(..)` as in `enum Foo { Bar(..) }`. |
| Tuple(Vec<StructField>, NodeId), |
| /// Unit variant. |
| /// |
| /// E.g., `Bar = ..` as in `enum Foo { Bar = .. }`. |
| Unit(NodeId), |
| } |
| |
| impl VariantData { |
| /// Return the fields of this variant. |
| pub fn fields(&self) -> &[StructField] { |
| match *self { |
| VariantData::Struct(ref fields, ..) | VariantData::Tuple(ref fields, _) => fields, |
| _ => &[], |
| } |
| } |
| |
| /// Return the `NodeId` of this variant's constructor, if it has one. |
| pub fn ctor_id(&self) -> Option<NodeId> { |
| match *self { |
| VariantData::Struct(..) => None, |
| VariantData::Tuple(_, id) | VariantData::Unit(id) => Some(id), |
| } |
| } |
| } |
| |
| /// An item. |
| /// |
| /// The name might be a dummy name in case of anonymous items. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct Item<K = ItemKind> { |
| pub attrs: Vec<Attribute>, |
| pub id: NodeId, |
| pub span: Span, |
| pub vis: Visibility, |
| pub ident: Ident, |
| |
| pub kind: K, |
| |
| /// Original tokens this item was parsed from. This isn't necessarily |
| /// available for all items, although over time more and more items should |
| /// have this be `Some`. Right now this is primarily used for procedural |
| /// macros, notably custom attributes. |
| /// |
| /// Note that the tokens here do not include the outer attributes, but will |
| /// include inner attributes. |
| pub tokens: Option<TokenStream>, |
| } |
| |
| impl Item { |
| /// Return the span that encompasses the attributes. |
| pub fn span_with_attributes(&self) -> Span { |
| self.attrs.iter().fold(self.span, |acc, attr| acc.to(attr.span)) |
| } |
| } |
| |
| /// `extern` qualifier on a function item or function type. |
| #[derive(Clone, Copy, RustcEncodable, RustcDecodable, Debug)] |
| pub enum Extern { |
| None, |
| Implicit, |
| Explicit(StrLit), |
| } |
| |
| impl Extern { |
| pub fn from_abi(abi: Option<StrLit>) -> Extern { |
| abi.map_or(Extern::Implicit, Extern::Explicit) |
| } |
| } |
| |
| /// A function header. |
| /// |
| /// All the information between the visibility and the name of the function is |
| /// included in this struct (e.g., `async unsafe fn` or `const extern "C" fn`). |
| #[derive(Clone, Copy, RustcEncodable, RustcDecodable, Debug)] |
| pub struct FnHeader { |
| pub unsafety: Unsafety, |
| pub asyncness: Spanned<IsAsync>, |
| pub constness: Spanned<Constness>, |
| pub ext: Extern, |
| } |
| |
| impl Default for FnHeader { |
| fn default() -> FnHeader { |
| FnHeader { |
| unsafety: Unsafety::Normal, |
| asyncness: dummy_spanned(IsAsync::NotAsync), |
| constness: dummy_spanned(Constness::NotConst), |
| ext: Extern::None, |
| } |
| } |
| } |
| |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum ItemKind { |
| /// An `extern crate` item, with the optional *original* crate name if the crate was renamed. |
| /// |
| /// E.g., `extern crate foo` or `extern crate foo_bar as foo`. |
| ExternCrate(Option<Name>), |
| /// A use declaration item (`use`). |
| /// |
| /// E.g., `use foo;`, `use foo::bar;` or `use foo::bar as FooBar;`. |
| Use(P<UseTree>), |
| /// A static item (`static`). |
| /// |
| /// E.g., `static FOO: i32 = 42;` or `static FOO: &'static str = "bar";`. |
| Static(P<Ty>, Mutability, P<Expr>), |
| /// A constant item (`const`). |
| /// |
| /// E.g., `const FOO: i32 = 42;`. |
| Const(P<Ty>, P<Expr>), |
| /// A function declaration (`fn`). |
| /// |
| /// E.g., `fn foo(bar: usize) -> usize { .. }`. |
| Fn(FnSig, Generics, P<Block>), |
| /// A module declaration (`mod`). |
| /// |
| /// E.g., `mod foo;` or `mod foo { .. }`. |
| Mod(Mod), |
| /// An external module (`extern`). |
| /// |
| /// E.g., `extern {}` or `extern "C" {}`. |
| ForeignMod(ForeignMod), |
| /// Module-level inline assembly (from `global_asm!()`). |
| GlobalAsm(P<GlobalAsm>), |
| /// A type alias (`type`). |
| /// |
| /// E.g., `type Foo = Bar<u8>;`. |
| TyAlias(P<Ty>, Generics), |
| /// An enum definition (`enum`). |
| /// |
| /// E.g., `enum Foo<A, B> { C<A>, D<B> }`. |
| Enum(EnumDef, Generics), |
| /// A struct definition (`struct`). |
| /// |
| /// E.g., `struct Foo<A> { x: A }`. |
| Struct(VariantData, Generics), |
| /// A union definition (`union`). |
| /// |
| /// E.g., `union Foo<A, B> { x: A, y: B }`. |
| Union(VariantData, Generics), |
| /// A trait declaration (`trait`). |
| /// |
| /// E.g., `trait Foo { .. }`, `trait Foo<T> { .. }` or `auto trait Foo {}`. |
| Trait(IsAuto, Unsafety, Generics, GenericBounds, Vec<TraitItem>), |
| /// Trait alias |
| /// |
| /// E.g., `trait Foo = Bar + Quux;`. |
| TraitAlias(Generics, GenericBounds), |
| /// An implementation. |
| /// |
| /// E.g., `impl<A> Foo<A> { .. }` or `impl<A> Trait for Foo<A> { .. }`. |
| Impl( |
| Unsafety, |
| ImplPolarity, |
| Defaultness, |
| Generics, |
| Option<TraitRef>, // (optional) trait this impl implements |
| P<Ty>, // self |
| Vec<ImplItem>, |
| ), |
| /// A macro invocation. |
| /// |
| /// E.g., `foo!(..)`. |
| Mac(Mac), |
| |
| /// A macro definition. |
| MacroDef(MacroDef), |
| } |
| |
| impl ItemKind { |
| pub fn descriptive_variant(&self) -> &str { |
| match *self { |
| ItemKind::ExternCrate(..) => "extern crate", |
| ItemKind::Use(..) => "use", |
| ItemKind::Static(..) => "static item", |
| ItemKind::Const(..) => "constant item", |
| ItemKind::Fn(..) => "function", |
| ItemKind::Mod(..) => "module", |
| ItemKind::ForeignMod(..) => "foreign module", |
| ItemKind::GlobalAsm(..) => "global asm", |
| ItemKind::TyAlias(..) => "type alias", |
| ItemKind::Enum(..) => "enum", |
| ItemKind::Struct(..) => "struct", |
| ItemKind::Union(..) => "union", |
| ItemKind::Trait(..) => "trait", |
| ItemKind::TraitAlias(..) => "trait alias", |
| ItemKind::Mac(..) | ItemKind::MacroDef(..) | ItemKind::Impl(..) => "item", |
| } |
| } |
| } |
| |
| pub type ForeignItem = Item<ForeignItemKind>; |
| |
| /// An item within an `extern` block. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub enum ForeignItemKind { |
| /// A foreign function. |
| Fn(P<FnDecl>, Generics), |
| /// A foreign static item (`static ext: u8`). |
| Static(P<Ty>, Mutability), |
| /// A foreign type. |
| Ty, |
| /// A macro invocation. |
| Macro(Mac), |
| } |
| |
| impl ForeignItemKind { |
| pub fn descriptive_variant(&self) -> &str { |
| match *self { |
| ForeignItemKind::Fn(..) => "foreign function", |
| ForeignItemKind::Static(..) => "foreign static item", |
| ForeignItemKind::Ty => "foreign type", |
| ForeignItemKind::Macro(..) => "macro in foreign module", |
| } |
| } |
| } |