syntax_data: {"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let state_did = tcx.require_lang_item(LangItem::CoroutineState, DUMMY_SP);
context_before:                     // The signature should be `Coroutine::resume(_, Resume) -> CoroutineState<Yield, Return>`
context_after:                     let state_adt_ref = tcx.adt_def(state_did);