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Title: fix: re-raise existing exception when available by KowalskiThomas · Pull Request #667 · msgpack/msgpack-python · GitHub

Open Graph Title: fix: re-raise existing exception when available by KowalskiThomas · Pull Request #667 · msgpack/msgpack-python

X Title: fix: re-raise existing exception when available by KowalskiThomas · Pull Request #667 · msgpack/msgpack-python

Description: What is this PR? This PR addresses an issue I found while working on #666 and reported in the description there. Looking at the usages of unpack_callback_uint32 (here for example, which calls into this) it seems like it checks for error values -2 and -3, but -1 will just raise ValueError("Unpack failed: error = %d" % (ret,)). It believe it should just raise to raise the existing exception set by PyErr_SetString if it exists. This PR addresses that problem here and another place.

Open Graph Description: What is this PR? This PR addresses an issue I found while working on #666 and reported in the description there. Looking at the usages of unpack_callback_uint32 (here for example, which calls into ...

X Description: What is this PR? This PR addresses an issue I found while working on #666 and reported in the description there. Looking at the usages of unpack_callback_uint32 (here for example, which calls into ...

Opengraph URL: https://github.com/msgpack/msgpack-python/pull/667

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1cefcd5 fix: re-raise existing exception when available KowalskiThomas Apr 21, 2026 https://github.com/msgpack/msgpack-python/pull/667/commits/1cefcd551b28ed549a1bc4ba1c1c2f72c624d975
2e54123 test: add tests for re-raising exceptions KowalskiThomas Apr 21, 2026 https://github.com/msgpack/msgpack-python/pull/667/commits/2e541230ab37b4093e10c75da5e4f80097a9ce39
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