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annotations: Add tests to check that async comprehensions produce errors #132513

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Apr 21, 2025
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annotations: Add tests to check that async comprehensions produce errors #132513

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22 changes: 18 additions & 4 deletions Lib/test/test_type_annotations.py
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Original file line number Diff line number Diff line change
Expand Up @@ -387,10 +387,21 @@ class Nested: ...
self.assertEqual(Outer.__annotations__, {"x": Outer.Nested})

def test_no_exotic_expressions(self):
check_syntax_error(self, "def func(x: (yield)): ...", "yield expression cannot be used within an annotation")
check_syntax_error(self, "def func(x: (yield from x)): ...", "yield expression cannot be used within an annotation")
check_syntax_error(self, "def func(x: (y := 3)): ...", "named expression cannot be used within an annotation")
check_syntax_error(self, "def func(x: (await 42)): ...", "await expression cannot be used within an annotation")
preludes = [
"",
"class X:\n ",
"def f():\n ",
"async def f():\n ",
]
for prelude in preludes:
with self.subTest(prelude=prelude):
check_syntax_error(self, prelude + "def func(x: (yield)): ...", "yield expression cannot be used within an annotation")
check_syntax_error(self, prelude + "def func(x: (yield from x)): ...", "yield expression cannot be used within an annotation")
check_syntax_error(self, prelude + "def func(x: (y := 3)): ...", "named expression cannot be used within an annotation")
check_syntax_error(self, prelude + "def func(x: (await 42)): ...", "await expression cannot be used within an annotation")
check_syntax_error(self, prelude + "def func(x: [y async for y in x]): ...", "asynchronous comprehension outside of an asynchronous function")
check_syntax_error(self, prelude + "def func(x: {y async for y in x}): ...", "asynchronous comprehension outside of an asynchronous function")
check_syntax_error(self, prelude + "def func(x: {y: y async for y in x}): ...", "asynchronous comprehension outside of an asynchronous function")

def test_no_exotic_expressions_in_unevaluated_annotations(self):
preludes = [
Expand All @@ -406,6 +417,9 @@ def test_no_exotic_expressions_in_unevaluated_annotations(self):
check_syntax_error(self, prelude + "(x): (y := 3)", "named expression cannot be used within an annotation")
check_syntax_error(self, prelude + "(x): (__debug__ := 3)", "named expression cannot be used within an annotation")
check_syntax_error(self, prelude + "(x): (await 42)", "await expression cannot be used within an annotation")
check_syntax_error(self, prelude + "(x): [y async for y in x]", "asynchronous comprehension outside of an asynchronous function")
check_syntax_error(self, prelude + "(x): {y async for y in x}", "asynchronous comprehension outside of an asynchronous function")
check_syntax_error(self, prelude + "(x): {y: y async for y in x}", "asynchronous comprehension outside of an asynchronous function")

def test_ignore_non_simple_annotations(self):
ns = run_code("class X: (y): int")
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