syntax_data: {"ast_node_type":"variable","tokens":[{"end":38,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let def_id = body.source.def_id();
context_before: pub fn sanity_check<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'tcx>) {
context_after:     if !tcx.has_attr(def_id, sym::rustc_mir) {