syntax_data: {"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let context_did = tcx.require_lang_item(LangItem::Context, DUMMY_SP);
context_before:     pub fn new_task_context(tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
context_after:         let context_adt_ref = tcx.adt_def(context_did);