bjoernager/rust
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Handle multiple applicable projection candidates

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This commit is contained in:
Matthew Jasper 2020-07-23 21:59:20 +01:00
parent bc08b791bc
commit cfee49593d
6 changed files with 82 additions and 37 deletions
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2
compiler/rustc_middle/src/query/mod.rs
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@ -157,7 +157,7 @@ rustc_queries! {
}
/// Returns the list of bounds that can be used for
/// `SelectionCandidate::ProjectionCandidate` and
/// `SelectionCandidate::ProjectionCandidate(_)` and
/// `ProjectionTyCandidate::TraitDef`.
/// Specifically this is the bounds written on the trait's type
/// definition, or those after the `impl` keyword

7
compiler/rustc_middle/src/traits/select.rs
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@ -105,9 +105,10 @@ pub enum SelectionCandidate<'tcx> {
ImplCandidate(DefId),
AutoImplCandidate(DefId),
/// This is a trait matching with a projected type as `Self`, and
/// we found an applicable bound in the trait definition.
ProjectionCandidate,
/// This is a trait matching with a projected type as `Self`, and we found
/// an applicable bound in the trait definition. The `usize` is an index
/// into the list returned by `tcx.item_bounds`.
ProjectionCandidate(usize),
/// Implementation of a `Fn`-family trait by one of the anonymous types
/// generated for a `||` expression.