syntax_data: {"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if let ty::ConstKind::Placeholder(p) = ct.kind() {
context_before:         let ct = self.infcx.shallow_resolve_const(ct);
context_after:             let replace_var = self.mapped_consts.get(&p);