[Issue 24701] New: No error produced from casted noreturn variable

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24701

          Issue ID: 24701
           Summary: No error produced from casted noreturn variable
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: elpenguino+D at gmail.com

```
void main() {
    noreturn foo;
    try {
        //auto a = cast(int)noreturn.init; // error properly produced
        auto a = cast(int)foo;
        assert(0);
    } catch (Throwable e) {
        assert(e.msg == "Accessed expression of type `noreturn`");
    }
}
```

In this example, cast(int)foo results in an int(0). An error is expected, as in
cast(int)noreturn.init.

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