syntax_data: {"ast_node_type":"other","tokens":[{"end":30,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:             if a_id == b_id =>
context_before:         (ty::CoroutineWitness(a_id, a_args), ty::CoroutineWitness(b_id, b_args))
context_after:         {