diff options
Diffstat (limited to 'compiler/rustc_trait_selection/src/solve/select.rs')
| -rw-r--r-- | compiler/rustc_trait_selection/src/solve/select.rs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/compiler/rustc_trait_selection/src/solve/select.rs b/compiler/rustc_trait_selection/src/solve/select.rs index 1661852903c..b0b6274907d 100644 --- a/compiler/rustc_trait_selection/src/solve/select.rs +++ b/compiler/rustc_trait_selection/src/solve/select.rs @@ -117,6 +117,10 @@ fn candidate_should_be_dropped_in_favor_of<'tcx>( CandidateSource::BuiltinImpl(BuiltinImplSource::Object(a)), CandidateSource::BuiltinImpl(BuiltinImplSource::Object(b)), ) => a >= b, + ( + CandidateSource::BuiltinImpl(BuiltinImplSource::TraitUpcasting(a)), + CandidateSource::BuiltinImpl(BuiltinImplSource::TraitUpcasting(b)), + ) => a >= b, // Prefer dyn candidates over non-dyn candidates. This is necessary to // handle the unsoundness between `impl<T: ?Sized> Any for T` and `dyn Any: Any`. ( |