syntax_data: {"ast_node_type":"variable","tokens":[{"end":29,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let res = match res {
context_before:     ) -> PatKind<'tcx> {
context_after:             Res::Def(DefKind::Ctor(CtorOf::Variant, ..), variant_ctor_id) => {