### Input
grammar {
    adapt rule expr {
        adapt group base {
            x <- "$" x:#this;
        }
    }
}
let z = (_: Type) => Type;
grammar {
    adapt rule expr {
        adapt group base {
            $z x <- "%" x:#this;
        }
    }
}
let y = Type;
%y

### Eval
Type

### Type
Type