Fix issue 21663 - std.concurrency.receiveOnly doesn't work with tuples

[pbackus]

No description provided.

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	21663	regression	std.concurrency.receiveOnly doesn't work with tuples

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "stable + phobos#7813"

[pbackus]

CI is failing because this targets stable and therefore doesn't have the changes from #7744.

[RazvanN7]

This is weird. The latest version of stable [1] does not include this test. It seems like the CI is using a prior version of stable :-?

[1] https://github.com/dlang/phobos/blob/stable/std/conv.d#L5710

[pbackus]

Looks like I just missed the latest update to stable (2a2a0b4). I've rebased again, which should fix it.