syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"Ok(Ty::new_coroutine(cx,"}]}
source_snippet:             Ok(Ty::new_coroutine(cx, a_id, args))
context_before:             let args = relate_args_invariantly(relation, a_args, b_args)?;
context_after:         }