Please see: https://run.dlang.io/is/2mwcPH

I'd expect that the `isInstanceOf` would be true instead of false here.

Commenting out the public import changes the output of `fullyQualifiedName`. I can kind of see why this happens, but it's kind of annoying when things like `isInstanceOf` silently fail due to this.

For context: I found this after getting a compiler error after stitching a bunch of D files together, which is why there's a mix of a public import and local import in the same file.

Part of me feels like it's a bug since if the alias `T` is using one "version" (for lack of a better word) of `Nullable`, then surely that same "version" would be given to `isInstanceOf`?

It can get a bit more interesting as well: https://run.dlang.io/is/n5jzJs

On Thursday, 28 January 2021 at 13:07:13 UTC, SealabJaster wrote:
> Please see: https://run.dlang.io/is/2mwcPH
>
> I'd expect that the `isInstanceOf` would be true instead of false here.
>
> Commenting out the public import changes the output of `fullyQualifiedName`. I can kind of see why this happens, but it's kind of annoying when things like `isInstanceOf` silently fail due to this.

Looks like a bug to me. I recommend filing a bug report on issues.dlang.org.

On Thursday, 28 January 2021 at 13:13:46 UTC, Paul Backus wrote:
> ...

https://issues.dlang.org/show_bug.cgi?id=21589

These issues are always so subtle and specific yet so annoying, e.g.:

https://issues.dlang.org/show_bug.cgi?id=21496

and

https://issues.dlang.org/show_bug.cgi?id=21377