syntax_data: {"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if let ty::ConstKind::Unevaluated(uv) = self.c.kind() {
context_before:     fn mk_err(&self, mut err: Diag<'_>, ty: Ty<'tcx>) -> Box<Pat<'tcx>> {
context_after:             let def_kind = self.tcx.def_kind(uv.def);