static assert not printing out along the error diagnostic

[someone]

On Wednesday, 14 July 2021 at 02:42:21 UTC, Paul Backus wrote:

> Weirdly, adding a dummy `ResultType` declaration to the `else`  
> branch makes the assert message show up:

My code is like following:

```d
public struct gudtUGC(typeStringUTF) {

    static if (! (is (typeStringUTF == string) || is 
(typeStringUTF == wstring) || is (typeStringUTF == dstring))) {

       static assert(false, r"ooops … gudtUGC structure requires 
[string|wstring|dstring] ≠ ["d ~ typeStringUTF.stringof ~ r"]"d);

       /// meaning: this will halt compilation if this UDT was 
instantiated with a type other than the ones intended

    } else {

    ... actual structure code

    }

}
```

... and it never fired the assert when I added something like:

```d
gudtUGC(int) something = gudtUGC(1); /// invalid of course
```

in main() ... so then I went to the D docs and to Ali's book 
afterward and there I tested his example to same results.