syntax_data: {"ast_node_type":"variable","tokens":[{"end":44,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let typeck_results = tcx.typeck(def_id);
context_before: pub(crate) fn check_match(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Result<(), ErrorGuaranteed> {
context_after:     let (thir, expr) = tcx.thir_body(def_id)?;