syntax_data: {"ast_node_type":"variable","tokens":[{"end":45,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let typeck_results = tcx.typeck(def);
context_before:     fn new(tcx: TyCtxt<'tcx>, def: LocalDefId) -> Self {
context_after:         let hir_id = tcx.local_def_id_to_hir_id(def);