| // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| use check::FnCtxt; |
| use constrained_type_params::{identify_constrained_type_params, Parameter}; |
| use CrateCtxt; |
| use hir::def_id::DefId; |
| use middle::region::{CodeExtent}; |
| use rustc::ty::subst::{self, TypeSpace, FnSpace, ParamSpace, SelfSpace}; |
| use rustc::traits; |
| use rustc::ty::{self, Ty, TyCtxt}; |
| |
| use std::collections::HashSet; |
| use syntax::ast; |
| use syntax::parse::token::keywords; |
| use syntax_pos::Span; |
| use errors::DiagnosticBuilder; |
| |
| use rustc::hir::intravisit::{self, Visitor}; |
| use rustc::hir; |
| |
| pub struct CheckTypeWellFormedVisitor<'ccx, 'tcx:'ccx> { |
| ccx: &'ccx CrateCtxt<'ccx, 'tcx>, |
| code: traits::ObligationCauseCode<'tcx>, |
| } |
| |
| /// Helper type of a temporary returned by .for_item(...). |
| /// Necessary because we can't write the following bound: |
| /// F: for<'b, 'tcx> where 'gcx: 'tcx FnOnce(FnCtxt<'b, 'gcx, 'tcx>). |
| struct CheckWfFcxBuilder<'a, 'gcx: 'a+'tcx, 'tcx: 'a> { |
| inherited: super::InheritedBuilder<'a, 'gcx, 'tcx>, |
| code: traits::ObligationCauseCode<'gcx>, |
| id: ast::NodeId, |
| span: Span |
| } |
| |
| impl<'a, 'gcx, 'tcx> CheckWfFcxBuilder<'a, 'gcx, 'tcx> { |
| fn with_fcx<F>(&'tcx mut self, f: F) where |
| F: for<'b> FnOnce(&FnCtxt<'b, 'gcx, 'tcx>, |
| &mut CheckTypeWellFormedVisitor<'b, 'gcx>) -> Vec<Ty<'tcx>> |
| { |
| let code = self.code.clone(); |
| let id = self.id; |
| let span = self.span; |
| self.inherited.enter(|inh| { |
| let fcx = FnCtxt::new(&inh, ty::FnDiverging, id); |
| let wf_tys = f(&fcx, &mut CheckTypeWellFormedVisitor { |
| ccx: fcx.ccx, |
| code: code |
| }); |
| fcx.select_all_obligations_or_error(); |
| fcx.regionck_item(id, span, &wf_tys); |
| }); |
| } |
| } |
| |
| impl<'ccx, 'gcx> CheckTypeWellFormedVisitor<'ccx, 'gcx> { |
| pub fn new(ccx: &'ccx CrateCtxt<'ccx, 'gcx>) |
| -> CheckTypeWellFormedVisitor<'ccx, 'gcx> { |
| CheckTypeWellFormedVisitor { |
| ccx: ccx, |
| code: traits::ObligationCauseCode::MiscObligation |
| } |
| } |
| |
| fn tcx(&self) -> TyCtxt<'ccx, 'gcx, 'gcx> { |
| self.ccx.tcx |
| } |
| |
| /// Checks that the field types (in a struct def'n) or argument types (in an enum def'n) are |
| /// well-formed, meaning that they do not require any constraints not declared in the struct |
| /// definition itself. For example, this definition would be illegal: |
| /// |
| /// struct Ref<'a, T> { x: &'a T } |
| /// |
| /// because the type did not declare that `T:'a`. |
| /// |
| /// We do this check as a pre-pass before checking fn bodies because if these constraints are |
| /// not included it frequently leads to confusing errors in fn bodies. So it's better to check |
| /// the types first. |
| fn check_item_well_formed(&mut self, item: &hir::Item) { |
| let ccx = self.ccx; |
| debug!("check_item_well_formed(it.id={}, it.name={})", |
| item.id, |
| ccx.tcx.item_path_str(ccx.tcx.map.local_def_id(item.id))); |
| |
| match item.node { |
| /// Right now we check that every default trait implementation |
| /// has an implementation of itself. Basically, a case like: |
| /// |
| /// `impl Trait for T {}` |
| /// |
| /// has a requirement of `T: Trait` which was required for default |
| /// method implementations. Although this could be improved now that |
| /// there's a better infrastructure in place for this, it's being left |
| /// for a follow-up work. |
| /// |
| /// Since there's such a requirement, we need to check *just* positive |
| /// implementations, otherwise things like: |
| /// |
| /// impl !Send for T {} |
| /// |
| /// won't be allowed unless there's an *explicit* implementation of `Send` |
| /// for `T` |
| hir::ItemImpl(_, hir::ImplPolarity::Positive, _, |
| ref trait_ref, ref self_ty, _) => { |
| self.check_impl(item, self_ty, trait_ref); |
| } |
| hir::ItemImpl(_, hir::ImplPolarity::Negative, _, Some(_), _, _) => { |
| // FIXME(#27579) what amount of WF checking do we need for neg impls? |
| |
| let trait_ref = ccx.tcx.impl_trait_ref(ccx.tcx.map.local_def_id(item.id)).unwrap(); |
| ccx.tcx.populate_implementations_for_trait_if_necessary(trait_ref.def_id); |
| match ccx.tcx.lang_items.to_builtin_kind(trait_ref.def_id) { |
| Some(ty::BoundSend) | Some(ty::BoundSync) => {} |
| Some(_) | None => { |
| if !ccx.tcx.trait_has_default_impl(trait_ref.def_id) { |
| error_192(ccx, item.span); |
| } |
| } |
| } |
| } |
| hir::ItemFn(_, _, _, _, _, ref body) => { |
| self.check_item_fn(item, body); |
| } |
| hir::ItemStatic(..) => { |
| self.check_item_type(item); |
| } |
| hir::ItemConst(..) => { |
| self.check_item_type(item); |
| } |
| hir::ItemStruct(ref struct_def, ref ast_generics) => { |
| self.check_type_defn(item, |fcx| { |
| vec![fcx.struct_variant(struct_def)] |
| }); |
| |
| self.check_variances_for_type_defn(item, ast_generics); |
| } |
| hir::ItemEnum(ref enum_def, ref ast_generics) => { |
| self.check_type_defn(item, |fcx| { |
| fcx.enum_variants(enum_def) |
| }); |
| |
| self.check_variances_for_type_defn(item, ast_generics); |
| } |
| hir::ItemTrait(_, _, _, ref items) => { |
| self.check_trait(item, items); |
| } |
| _ => {} |
| } |
| } |
| |
| fn check_trait_or_impl_item(&mut self, item_id: ast::NodeId, span: Span) { |
| let code = self.code.clone(); |
| self.for_id(item_id, span).with_fcx(|fcx, this| { |
| let free_substs = &fcx.parameter_environment.free_substs; |
| let free_id_outlive = fcx.parameter_environment.free_id_outlive; |
| |
| let item = fcx.tcx.impl_or_trait_item(fcx.tcx.map.local_def_id(item_id)); |
| |
| let (mut implied_bounds, self_ty) = match item.container() { |
| ty::TraitContainer(_) => (vec![], fcx.tcx.mk_self_type()), |
| ty::ImplContainer(def_id) => (fcx.impl_implied_bounds(def_id, span), |
| fcx.tcx.lookup_item_type(def_id).ty) |
| }; |
| |
| match item { |
| ty::ConstTraitItem(assoc_const) => { |
| let ty = fcx.instantiate_type_scheme(span, free_substs, &assoc_const.ty); |
| fcx.register_wf_obligation(ty, span, code.clone()); |
| } |
| ty::MethodTraitItem(method) => { |
| reject_shadowing_type_parameters(fcx.tcx, span, &method.generics); |
| let method_ty = fcx.instantiate_type_scheme(span, free_substs, &method.fty); |
| let predicates = fcx.instantiate_bounds(span, free_substs, &method.predicates); |
| this.check_fn_or_method(fcx, span, &method_ty, &predicates, |
| free_id_outlive, &mut implied_bounds); |
| this.check_method_receiver(fcx, span, &method, |
| free_id_outlive, self_ty); |
| } |
| ty::TypeTraitItem(assoc_type) => { |
| if let Some(ref ty) = assoc_type.ty { |
| let ty = fcx.instantiate_type_scheme(span, free_substs, ty); |
| fcx.register_wf_obligation(ty, span, code.clone()); |
| } |
| } |
| } |
| |
| implied_bounds |
| }) |
| } |
| |
| fn for_item<'tcx>(&self, item: &hir::Item) |
| -> CheckWfFcxBuilder<'ccx, 'gcx, 'tcx> { |
| self.for_id(item.id, item.span) |
| } |
| |
| fn for_id<'tcx>(&self, id: ast::NodeId, span: Span) |
| -> CheckWfFcxBuilder<'ccx, 'gcx, 'tcx> { |
| let param_env = ty::ParameterEnvironment::for_item(self.ccx.tcx, id); |
| CheckWfFcxBuilder { |
| inherited: self.ccx.inherited(Some(param_env)), |
| code: self.code.clone(), |
| id: id, |
| span: span |
| } |
| } |
| |
| /// In a type definition, we check that to ensure that the types of the fields are well-formed. |
| fn check_type_defn<F>(&mut self, item: &hir::Item, mut lookup_fields: F) where |
| F: for<'fcx, 'tcx> FnMut(&FnCtxt<'fcx, 'gcx, 'tcx>) |
| -> Vec<AdtVariant<'tcx>> |
| { |
| self.for_item(item).with_fcx(|fcx, this| { |
| let variants = lookup_fields(fcx); |
| |
| for variant in &variants { |
| // For DST, all intermediate types must be sized. |
| if let Some((_, fields)) = variant.fields.split_last() { |
| for field in fields { |
| fcx.register_builtin_bound( |
| field.ty, |
| ty::BoundSized, |
| traits::ObligationCause::new(field.span, |
| fcx.body_id, |
| traits::FieldSized)); |
| } |
| } |
| |
| // All field types must be well-formed. |
| for field in &variant.fields { |
| fcx.register_wf_obligation(field.ty, field.span, this.code.clone()) |
| } |
| } |
| |
| let free_substs = &fcx.parameter_environment.free_substs; |
| let predicates = fcx.tcx.lookup_predicates(fcx.tcx.map.local_def_id(item.id)); |
| let predicates = fcx.instantiate_bounds(item.span, free_substs, &predicates); |
| this.check_where_clauses(fcx, item.span, &predicates); |
| |
| vec![] // no implied bounds in a struct def'n |
| }); |
| } |
| |
| fn check_trait(&mut self, |
| item: &hir::Item, |
| items: &[hir::TraitItem]) |
| { |
| let trait_def_id = self.tcx().map.local_def_id(item.id); |
| |
| if self.tcx().trait_has_default_impl(trait_def_id) { |
| if !items.is_empty() { |
| error_380(self.ccx, item.span); |
| } |
| } |
| |
| self.for_item(item).with_fcx(|fcx, this| { |
| let free_substs = &fcx.parameter_environment.free_substs; |
| let predicates = fcx.tcx.lookup_predicates(trait_def_id); |
| let predicates = fcx.instantiate_bounds(item.span, free_substs, &predicates); |
| this.check_where_clauses(fcx, item.span, &predicates); |
| vec![] |
| }); |
| } |
| |
| fn check_item_fn(&mut self, |
| item: &hir::Item, |
| body: &hir::Block) |
| { |
| self.for_item(item).with_fcx(|fcx, this| { |
| let free_substs = &fcx.parameter_environment.free_substs; |
| let type_scheme = fcx.tcx.lookup_item_type(fcx.tcx.map.local_def_id(item.id)); |
| let item_ty = fcx.instantiate_type_scheme(item.span, free_substs, &type_scheme.ty); |
| let bare_fn_ty = match item_ty.sty { |
| ty::TyFnDef(_, _, ref bare_fn_ty) => bare_fn_ty, |
| _ => { |
| span_bug!(item.span, "Fn item without fn type"); |
| } |
| }; |
| |
| let predicates = fcx.tcx.lookup_predicates(fcx.tcx.map.local_def_id(item.id)); |
| let predicates = fcx.instantiate_bounds(item.span, free_substs, &predicates); |
| |
| let mut implied_bounds = vec![]; |
| let free_id_outlive = fcx.tcx.region_maps.call_site_extent(item.id, body.id); |
| this.check_fn_or_method(fcx, item.span, bare_fn_ty, &predicates, |
| free_id_outlive, &mut implied_bounds); |
| implied_bounds |
| }) |
| } |
| |
| fn check_item_type(&mut self, |
| item: &hir::Item) |
| { |
| debug!("check_item_type: {:?}", item); |
| |
| self.for_item(item).with_fcx(|fcx, this| { |
| let type_scheme = fcx.tcx.lookup_item_type(fcx.tcx.map.local_def_id(item.id)); |
| let item_ty = fcx.instantiate_type_scheme(item.span, |
| &fcx.parameter_environment |
| .free_substs, |
| &type_scheme.ty); |
| |
| fcx.register_wf_obligation(item_ty, item.span, this.code.clone()); |
| |
| vec![] // no implied bounds in a const etc |
| }); |
| } |
| |
| fn check_impl(&mut self, |
| item: &hir::Item, |
| ast_self_ty: &hir::Ty, |
| ast_trait_ref: &Option<hir::TraitRef>) |
| { |
| debug!("check_impl: {:?}", item); |
| |
| self.for_item(item).with_fcx(|fcx, this| { |
| let free_substs = &fcx.parameter_environment.free_substs; |
| let item_def_id = fcx.tcx.map.local_def_id(item.id); |
| |
| match *ast_trait_ref { |
| Some(ref ast_trait_ref) => { |
| let trait_ref = fcx.tcx.impl_trait_ref(item_def_id).unwrap(); |
| let trait_ref = |
| fcx.instantiate_type_scheme( |
| ast_trait_ref.path.span, free_substs, &trait_ref); |
| let obligations = |
| ty::wf::trait_obligations(fcx, |
| fcx.body_id, |
| &trait_ref, |
| ast_trait_ref.path.span); |
| for obligation in obligations { |
| fcx.register_predicate(obligation); |
| } |
| } |
| None => { |
| let self_ty = fcx.tcx.node_id_to_type(item.id); |
| let self_ty = fcx.instantiate_type_scheme(item.span, free_substs, &self_ty); |
| fcx.register_wf_obligation(self_ty, ast_self_ty.span, this.code.clone()); |
| } |
| } |
| |
| let predicates = fcx.tcx.lookup_predicates(item_def_id); |
| let predicates = fcx.instantiate_bounds(item.span, free_substs, &predicates); |
| this.check_where_clauses(fcx, item.span, &predicates); |
| |
| fcx.impl_implied_bounds(fcx.tcx.map.local_def_id(item.id), item.span) |
| }); |
| } |
| |
| fn check_where_clauses<'fcx, 'tcx>(&mut self, |
| fcx: &FnCtxt<'fcx, 'gcx, 'tcx>, |
| span: Span, |
| predicates: &ty::InstantiatedPredicates<'tcx>) |
| { |
| let obligations = |
| predicates.predicates |
| .iter() |
| .flat_map(|p| ty::wf::predicate_obligations(fcx, |
| fcx.body_id, |
| p, |
| span)); |
| |
| for obligation in obligations { |
| fcx.register_predicate(obligation); |
| } |
| } |
| |
| fn check_fn_or_method<'fcx, 'tcx>(&mut self, |
| fcx: &FnCtxt<'fcx, 'gcx, 'tcx>, |
| span: Span, |
| fty: &'tcx ty::BareFnTy<'tcx>, |
| predicates: &ty::InstantiatedPredicates<'tcx>, |
| free_id_outlive: CodeExtent, |
| implied_bounds: &mut Vec<Ty<'tcx>>) |
| { |
| let free_substs = &fcx.parameter_environment.free_substs; |
| let fty = fcx.instantiate_type_scheme(span, free_substs, &fty); |
| let sig = fcx.tcx.liberate_late_bound_regions(free_id_outlive, &fty.sig); |
| |
| for &input_ty in &sig.inputs { |
| fcx.register_wf_obligation(input_ty, span, self.code.clone()); |
| } |
| implied_bounds.extend(sig.inputs); |
| |
| match sig.output { |
| ty::FnConverging(output) => { |
| fcx.register_wf_obligation(output, span, self.code.clone()); |
| |
| // FIXME(#25759) return types should not be implied bounds |
| implied_bounds.push(output); |
| } |
| ty::FnDiverging => { } |
| } |
| |
| self.check_where_clauses(fcx, span, predicates); |
| } |
| |
| fn check_method_receiver<'fcx, 'tcx>(&mut self, |
| fcx: &FnCtxt<'fcx, 'gcx, 'tcx>, |
| span: Span, |
| method: &ty::Method<'tcx>, |
| free_id_outlive: CodeExtent, |
| self_ty: ty::Ty<'tcx>) |
| { |
| // check that the type of the method's receiver matches the |
| // method's first parameter. |
| |
| let free_substs = &fcx.parameter_environment.free_substs; |
| let fty = fcx.instantiate_type_scheme(span, free_substs, &method.fty); |
| let sig = fcx.tcx.liberate_late_bound_regions(free_id_outlive, &fty.sig); |
| |
| debug!("check_method_receiver({:?},cat={:?},self_ty={:?},sig={:?})", |
| method.name, method.explicit_self, self_ty, sig); |
| |
| let rcvr_ty = match method.explicit_self { |
| ty::ExplicitSelfCategory::Static => return, |
| ty::ExplicitSelfCategory::ByValue => self_ty, |
| ty::ExplicitSelfCategory::ByReference(region, mutability) => { |
| fcx.tcx.mk_ref(fcx.tcx.mk_region(region), ty::TypeAndMut { |
| ty: self_ty, |
| mutbl: mutability |
| }) |
| } |
| ty::ExplicitSelfCategory::ByBox => fcx.tcx.mk_box(self_ty) |
| }; |
| let rcvr_ty = fcx.instantiate_type_scheme(span, free_substs, &rcvr_ty); |
| let rcvr_ty = fcx.tcx.liberate_late_bound_regions(free_id_outlive, |
| &ty::Binder(rcvr_ty)); |
| |
| debug!("check_method_receiver: receiver ty = {:?}", rcvr_ty); |
| |
| fcx.require_same_types(span, sig.inputs[0], rcvr_ty, |
| "mismatched method receiver"); |
| } |
| |
| fn check_variances_for_type_defn(&self, |
| item: &hir::Item, |
| ast_generics: &hir::Generics) |
| { |
| let item_def_id = self.tcx().map.local_def_id(item.id); |
| let ty_predicates = self.tcx().lookup_predicates(item_def_id); |
| let variances = self.tcx().item_variances(item_def_id); |
| |
| let mut constrained_parameters: HashSet<_> = |
| variances.types |
| .iter_enumerated() |
| .filter(|&(_, _, &variance)| variance != ty::Bivariant) |
| .map(|(space, index, _)| self.param_ty(ast_generics, space, index)) |
| .map(|p| Parameter::Type(p)) |
| .collect(); |
| |
| identify_constrained_type_params(ty_predicates.predicates.as_slice(), |
| None, |
| &mut constrained_parameters); |
| |
| for (space, index, _) in variances.types.iter_enumerated() { |
| let param_ty = self.param_ty(ast_generics, space, index); |
| if constrained_parameters.contains(&Parameter::Type(param_ty)) { |
| continue; |
| } |
| let span = self.ty_param_span(ast_generics, item, space, index); |
| self.report_bivariance(span, param_ty.name); |
| } |
| |
| for (space, index, &variance) in variances.regions.iter_enumerated() { |
| if variance != ty::Bivariant { |
| continue; |
| } |
| |
| assert_eq!(space, TypeSpace); |
| let span = ast_generics.lifetimes[index].lifetime.span; |
| let name = ast_generics.lifetimes[index].lifetime.name; |
| self.report_bivariance(span, name); |
| } |
| } |
| |
| fn param_ty(&self, |
| ast_generics: &hir::Generics, |
| space: ParamSpace, |
| index: usize) |
| -> ty::ParamTy |
| { |
| let name = match space { |
| TypeSpace => ast_generics.ty_params[index].name, |
| SelfSpace => keywords::SelfType.name(), |
| FnSpace => bug!("Fn space occupied?"), |
| }; |
| |
| ty::ParamTy { space: space, idx: index as u32, name: name } |
| } |
| |
| fn ty_param_span(&self, |
| ast_generics: &hir::Generics, |
| item: &hir::Item, |
| space: ParamSpace, |
| index: usize) |
| -> Span |
| { |
| match space { |
| TypeSpace => ast_generics.ty_params[index].span, |
| SelfSpace => item.span, |
| FnSpace => span_bug!(item.span, "Fn space occupied?"), |
| } |
| } |
| |
| fn report_bivariance(&self, |
| span: Span, |
| param_name: ast::Name) |
| { |
| let mut err = error_392(self.ccx, span, param_name); |
| |
| let suggested_marker_id = self.tcx().lang_items.phantom_data(); |
| match suggested_marker_id { |
| Some(def_id) => { |
| err.help( |
| &format!("consider removing `{}` or using a marker such as `{}`", |
| param_name, |
| self.tcx().item_path_str(def_id))); |
| } |
| None => { |
| // no lang items, no help! |
| } |
| } |
| err.emit(); |
| } |
| } |
| |
| fn reject_shadowing_type_parameters(tcx: TyCtxt, span: Span, generics: &ty::Generics) { |
| let impl_params = generics.types.get_slice(subst::TypeSpace).iter() |
| .map(|tp| tp.name).collect::<HashSet<_>>(); |
| |
| for method_param in generics.types.get_slice(subst::FnSpace) { |
| if impl_params.contains(&method_param.name) { |
| error_194(tcx, span, method_param.name); |
| } |
| } |
| } |
| |
| impl<'ccx, 'tcx, 'v> Visitor<'v> for CheckTypeWellFormedVisitor<'ccx, 'tcx> { |
| fn visit_item(&mut self, i: &hir::Item) { |
| debug!("visit_item: {:?}", i); |
| self.check_item_well_formed(i); |
| intravisit::walk_item(self, i); |
| } |
| |
| fn visit_trait_item(&mut self, trait_item: &'v hir::TraitItem) { |
| debug!("visit_trait_item: {:?}", trait_item); |
| self.check_trait_or_impl_item(trait_item.id, trait_item.span); |
| intravisit::walk_trait_item(self, trait_item) |
| } |
| |
| fn visit_impl_item(&mut self, impl_item: &'v hir::ImplItem) { |
| debug!("visit_impl_item: {:?}", impl_item); |
| self.check_trait_or_impl_item(impl_item.id, impl_item.span); |
| intravisit::walk_impl_item(self, impl_item) |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // ADT |
| |
| struct AdtVariant<'tcx> { |
| fields: Vec<AdtField<'tcx>>, |
| } |
| |
| struct AdtField<'tcx> { |
| ty: Ty<'tcx>, |
| span: Span, |
| } |
| |
| impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> { |
| fn struct_variant(&self, struct_def: &hir::VariantData) -> AdtVariant<'tcx> { |
| let fields = |
| struct_def.fields().iter() |
| .map(|field| { |
| let field_ty = self.tcx.node_id_to_type(field.id); |
| let field_ty = self.instantiate_type_scheme(field.span, |
| &self.parameter_environment |
| .free_substs, |
| &field_ty); |
| AdtField { ty: field_ty, span: field.span } |
| }) |
| .collect(); |
| AdtVariant { fields: fields } |
| } |
| |
| fn enum_variants(&self, enum_def: &hir::EnumDef) -> Vec<AdtVariant<'tcx>> { |
| enum_def.variants.iter() |
| .map(|variant| self.struct_variant(&variant.node.data)) |
| .collect() |
| } |
| |
| fn impl_implied_bounds(&self, impl_def_id: DefId, span: Span) -> Vec<Ty<'tcx>> { |
| let free_substs = &self.parameter_environment.free_substs; |
| match self.tcx.impl_trait_ref(impl_def_id) { |
| Some(ref trait_ref) => { |
| // Trait impl: take implied bounds from all types that |
| // appear in the trait reference. |
| let trait_ref = self.instantiate_type_scheme(span, free_substs, trait_ref); |
| trait_ref.substs.types.as_slice().to_vec() |
| } |
| |
| None => { |
| // Inherent impl: take implied bounds from the self type. |
| let self_ty = self.tcx.lookup_item_type(impl_def_id).ty; |
| let self_ty = self.instantiate_type_scheme(span, free_substs, &self_ty); |
| vec![self_ty] |
| } |
| } |
| } |
| } |
| |
| fn error_192(ccx: &CrateCtxt, span: Span) { |
| span_err!(ccx.tcx.sess, span, E0192, |
| "negative impls are only allowed for traits with \ |
| default impls (e.g., `Send` and `Sync`)") |
| } |
| |
| fn error_380(ccx: &CrateCtxt, span: Span) { |
| span_err!(ccx.tcx.sess, span, E0380, |
| "traits with default impls (`e.g. unsafe impl \ |
| Trait for ..`) must have no methods or associated items") |
| } |
| |
| fn error_392<'a, 'tcx>(ccx: &CrateCtxt<'a, 'tcx>, span: Span, param_name: ast::Name) |
| -> DiagnosticBuilder<'tcx> { |
| struct_span_err!(ccx.tcx.sess, span, E0392, |
| "parameter `{}` is never used", param_name) |
| } |
| |
| fn error_194(tcx: TyCtxt, span: Span, name: ast::Name) { |
| span_err!(tcx.sess, span, E0194, |
| "type parameter `{}` shadows another type parameter of the same name", |
| name); |
| } |
