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-rw-r--r--compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs b/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
index ea264c8064a..6d69040c711 100644
--- a/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
@@ -716,7 +716,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
             return (false, false, None);
         };
 
-        let implemented_trait_item = self.infcx.tcx.associated_item(my_def).trait_item_def_id;
+        let implemented_trait_item = self.infcx.tcx.trait_item_of(my_def);
 
         (
             true,