syntax_data: {"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"tcx.impl_trait_ref(impl_def_id).unwrap().instantiate_identity().args,"}]}
source_snippet:                         tcx.impl_trait_ref(impl_def_id).unwrap().instantiate_identity().args,
context_before:                         impl_def_id.to_def_id(),
context_after:                     );