syntax_data: {"ast_node_type":"variable","tokens":[{"end":38,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let adt_def = tcx.adt_def(def_id);
context_before: fn params_in_repr(tcx: TyCtxt<'_>, def_id: LocalDefId) -> DenseBitSet<u32> {
context_after:     let generics = tcx.generics_of(def_id);