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Diffstat (limited to 'crates/hir-ty/src/chalk_ext.rs')
| -rw-r--r-- | crates/hir-ty/src/chalk_ext.rs | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/crates/hir-ty/src/chalk_ext.rs b/crates/hir-ty/src/chalk_ext.rs index a9c124b42d..4a5533c648 100644 --- a/crates/hir-ty/src/chalk_ext.rs +++ b/crates/hir-ty/src/chalk_ext.rs @@ -164,6 +164,8 @@ impl TyExt for Ty { fn dyn_trait(&self) -> Option<TraitId> { let trait_ref = match self.kind(Interner) { + // The principal trait bound should be the first element of the bounds. This is an + // invariant ensured by `TyLoweringContext::lower_dyn_trait()`. TyKind::Dyn(dyn_ty) => dyn_ty.bounds.skip_binders().interned().get(0).and_then(|b| { match b.skip_binders() { WhereClause::Implemented(trait_ref) => Some(trait_ref), |