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-rw-r--r--src/librustdoc/clean/mod.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index c20595614b0..a49c631035b 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -318,6 +318,7 @@ pub(crate) fn clean_predicate<'tcx>(
         | ty::PredicateKind::ObjectSafe(..)
         | ty::PredicateKind::ClosureKind(..)
         | ty::PredicateKind::ConstEquate(..)
+        | ty::PredicateKind::Ambiguous
         | ty::PredicateKind::TypeWellFormedFromEnv(..) => panic!("not user writable"),
     }
 }