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Added some comments, made add_bounds private.

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This commit is contained in:
Niko Matsakis 2019-05-08 15:58:20 -04:00 committed by Alexander Regueiro
parent 0f4a5ca33c
commit 538ebd197c
1 changed files with 14 additions and 1 deletions
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15
src/librustc_typeck/astconv.rs
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@ -699,6 +699,15 @@ impl<'o, 'gcx: 'tcx, 'tcx> dyn AstConv<'gcx, 'tcx> + 'o {
}, },
); );
// Convert associated-type bindings or constraints into a separate vector.
// Example: Given this:
//
// T: Iterator<Item = u32>
//
// The `T` is passed in as a self-type; the `Item = u32` is
// not a "type parameter" of the `Iterator` trait, but rather
// a restriction on `<T as Iterator>::Item`, so it is passed
// back separately.
let assoc_bindings = generic_args.bindings.iter() let assoc_bindings = generic_args.bindings.iter()
.map(|binding| { .map(|binding| {
let kind = if let hir::TyKind::AssocTyExistential(ref bounds) = binding.ty.node { let kind = if let hir::TyKind::AssocTyExistential(ref bounds) = binding.ty.node {
@ -899,7 +908,7 @@ impl<'o, 'gcx: 'tcx, 'tcx> dyn AstConv<'gcx, 'tcx> + 'o {
true true
} }
pub fn add_bounds(&self, fn add_bounds(&self,
param_ty: Ty<'tcx>, param_ty: Ty<'tcx>,
ast_bounds: &[hir::GenericBound], ast_bounds: &[hir::GenericBound],
bounds: &mut Bounds<'tcx>, bounds: &mut Bounds<'tcx>,
@ -1065,6 +1074,10 @@ impl<'o, 'gcx: 'tcx, 'tcx> dyn AstConv<'gcx, 'tcx> + 'o {
match binding.kind { match binding.kind {
ConvertedBindingKind::Equality(ref ty) => { ConvertedBindingKind::Equality(ref ty) => {
// "Desugar" a constraint like `T: Iterator<Item = u32>` this to
// the "projection predicate" for:
//
// `<T as Iterator>::Item = u32`
bounds.projection_bounds.push((candidate.map_bound(|trait_ref| { bounds.projection_bounds.push((candidate.map_bound(|trait_ref| {
ty::ProjectionPredicate { ty::ProjectionPredicate {
projection_ty: ty::ProjectionTy::from_ref_and_name( projection_ty: ty::ProjectionTy::from_ref_and_name(