diff options
Diffstat (limited to 'compiler/rustc_trait_selection/src')
| -rw-r--r-- | compiler/rustc_trait_selection/src/traits/project.rs | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/compiler/rustc_trait_selection/src/traits/project.rs b/compiler/rustc_trait_selection/src/traits/project.rs index 6ccb91c8cab..6c9efea8ca8 100644 --- a/compiler/rustc_trait_selection/src/traits/project.rs +++ b/compiler/rustc_trait_selection/src/traits/project.rs @@ -1308,9 +1308,9 @@ fn project<'cx, 'tcx>( } } -/// The first thing we have to do is scan through the parameter -/// environment to see whether there are any projection predicates -/// there that can answer this question. +/// If the predicate's item is an `ImplTraitPlaceholder`, we do a select on the +/// corresponding trait ref. If this yields an `impl`, then we're able to project +/// to a concrete type, since we have an `impl`'s method to provide the RPITIT. fn assemble_candidate_for_impl_trait_in_trait<'cx, 'tcx>( selcx: &mut SelectionContext<'cx, 'tcx>, obligation: &ProjectionTyObligation<'tcx>, |