+ TraitBoundModifier::MaybeConst => hir::TraitBoundModifier::MaybeConst,
+
+ // `MaybeConstMaybe` will cause an error during AST validation, but we need to pick a
+ // placeholder for compilation to proceed.
+ TraitBoundModifier::MaybeConstMaybe | TraitBoundModifier::Maybe => {
+ hir::TraitBoundModifier::Maybe
+ }