Why rethrows with Async[Throwing]PrefixWhileSequence

the AsyncDropWhileSequence doesn't have rethrows label.

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I have filed a bug: [SR-15494] Why rethrows with Async[Throwing]PrefixWhileSequence · Issue #57799 · apple/swift · GitHub

I ran into this issue recently as well in one of my projects, seems like a mistake.

I opened up a PR, hopefully there aren't any binary compatibility issues I'm not seeing: Remove spurious rethrows from Async[Throwing]PrefixWhileSequence by GeorgeLyon · Pull Request #40246 · apple/swift · GitHub

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