syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"typing_env,"}]}
source_snippet:                 typing_env, trait_item_id, rcvr_args, impl_data
context_before:                 "resolving ImplSource::UserDefined: {:?}, {:?}, {:?}, {:?}",
context_after:             );