On Saturday, 14 June 2025 at 23:49:19 UTC, Steven Schveighoffer
wrote:
If I had to guess, I think the compiler is not able to exactly
deduce what form your lambda should be instantiated with. I
think it's picking the first form it sees.
I think if anything, the error message is really weird. I'd
expect possibly an ambiguity error. But I'm not sure the
language is supposed to handle your case.
-Steve
theres correct ambiguity errors when the return types are well
typed; the code was wierd but I confirm theres a bug in here
