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gh-141174: Test re-stringifying a `ForwardRef` by dr-carlos · Pull Request #155689 · python/cpython · GitHub

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gh-141174: Test re-stringifying a ForwardRef #155689

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Merged
JelleZijlstra merged 1 commit into from
Aug 13, 2026
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gh-141174: Test re-stringifying a ForwardRef #155689

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5 changes: 5 additions & 0 deletions Lib/test/test_annotationlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2133,8 +2133,13 @@ def f(a: unknown | str | int | list[str] | tuple[int, ...]): ...
self.assertIsNone(fr.__resolved_str_cache__)

self.assertEqual(fr.evaluate(format=Format.STRING), "unknown | str | int | list[str] | tuple[int, ...]")

# Test that the cache is now set correctly
self.assertEqual(fr.__resolved_str_cache__, "unknown | str | int | list[str] | tuple[int, ...]")

# Test that future evaluations return the same cache
self.assertIs(fr.evaluate(format=Format.STRING), fr.__resolved_str_cache__)

def test_evaluate_forwardref_format(self):
fr = ForwardRef("undef")
evaluated = fr.evaluate(format=Format.FORWARDREF)
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