syntax_data: {"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"ExistentialTraitRef"}]}
source_snippet:         ExistentialTraitRef { def_id, args, _use_existential_trait_ref_new_instead: () }
context_before:         let args = interner.mk_args(&self.args.as_slice()[..args_count]);
context_after:     }