syntax_data: {"ast_node_type":"variable","tokens":[{"end":54,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let ct = self.infcx.shallow_resolve_const(ct);
context_before:     fn fold_const(&mut self, ct: ty::Const<'tcx>) -> ty::Const<'tcx> {
context_after:         if let ty::ConstKind::Placeholder(p) = ct.kind() {