syntax_data: {"ast_node_type":"enum","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let poll_enum = Ty::new_adt(tcx, poll_adt_ref, tcx.mk_args(&[tcx.types.unit.into()]));
context_before:         let poll_adt_ref = tcx.adt_def(tcx.require_lang_item(LangItem::Poll, source_info.span));
context_after:         let poll_decl = LocalDecl::new(poll_enum, source_info.span);