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-rw-r--r--src/librustc_ast_passes/ast_validation.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/librustc_ast_passes/ast_validation.rs b/src/librustc_ast_passes/ast_validation.rs
index 5f47c9eb2c2..cc88fbb295c 100644
--- a/src/librustc_ast_passes/ast_validation.rs
+++ b/src/librustc_ast_passes/ast_validation.rs
@@ -1291,6 +1291,8 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
     }
 }
 
+/// When encountering an equality constraint in a `where` clause, emit an error. If the code seems
+/// like it's setting an associated type, provide an appropriate suggestion.
 fn deny_equality_constraints(
     this: &mut AstValidator<'_>,
     predicate: &WhereEqPredicate,