[mypyc] Treat callable environment links as final - #21956
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p-sawicki
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Sep 8, 2026
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| try: | ||
| fn.__mypyc_env__ = None | ||
| except AttributeError: | ||
| pass | ||
| else: | ||
| assert False |
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I'll do this in a follow-up PR that is closely related to this PR.
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This allows faster attribute init and read ops to be used on free-threaded builds.
I checked that this made a trivial microbenchmark that uses a nested function about 1.3x faster on Python 3.14 (free-threaded).