syntax_data: {"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> Vec<(ty::OpaqueTypeKey<Self::Interner>, <Self::Interner as Interner>::Ty)>;
context_before:         &self,
context_after:     fn clone_opaque_types_added_since(