Invalid `pred` in `when` swallowed

### Nim Version

2.2.4

### Description

```nim
type X = enum
  a
  b

when pred(a) == b:
  echo "a"
else:
  echo "b"
```

`pred(a)` is not well-defined - this should fail to compile

### Current Output

```text
Compiles
```

### Expected Output

```text
Compile-time error
```

### Known Workarounds

_No response_

### Additional Information

_No response_