{"ast_node_type":"variable","tokens":[{"end":83,"kind":"keyword","start":0,"text":"if"}]}
        if let chalk_ir::ConstValue::Concrete(c) = &constant.data(Interner).value {
    ) -> Result<Const, Self::Error> {
            if let ConstScalar::UnevaluatedConst(id, subst) = &c.interned {