Add fast path to analyzing special form assignments #16561
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This showed up as hot spot in a CPU profile collected when running tests. This makes `mypy/test/testcheck.py` about 2% faster on my Linux desktop.
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Diff from mypy_primer, showing the effect of this PR on open source code: discord.py (https://github.com/Rapptz/discord.py): typechecking got 1.07x slower (175.8s -> 188.8s)
(Performance measurements are based on a single noisy sample)
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JelleZijlstra
approved these changes
Nov 25, 2023
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This showed up as hot spot in a CPU profile collected when running tests.
This makes
mypy/test/testcheck.pyabout 2% faster on my Linux desktop.