Gregory P. Smith <g...@krypto.org> added the comment:

I think it is worth getting such a change in.

its arguable that the compiler should be able to see through the union for this 
use case but I assume such a fix would only land in a recent clang version.

i'm attaching a variant on your patch that doesn't cast entire structs but just 
casts the VLA.

thoughts?

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Added file: https://bugs.python.org/file47542/maybe-less-horrible-gps01.patch

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