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DisallowTypeVar constraints parameterized by type variables#18186

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@brianschubert
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Emit an error forthis test case from the conformance tests:

classTest(Generic[T]):BadConstraint2=TypeVar("BadConstraint2",str,list[T])# E

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Conformance results diff for this PR (generics_basic now passes):

diff --git a/conformance/results/mypy/generics_basic.toml b/conformance/results/mypy/generics_basic.tomlindex 00c8244..b15fe50 100644--- a/conformance/results/mypy/generics_basic.toml+++ b/conformance/results/mypy/generics_basic.toml@@ -6,6 +6,7 @@ output = """ generics_basic.py:40: error: Value of type variable "AnyStr" of "concat" cannot be "Sequence[object]"  [type-var] generics_basic.py:41: error: Value of type variable "AnyStr" of "concat" cannot be "Sequence[object]"  [type-var] generics_basic.py:49: error: Type variable must have at least two constrained types  [misc]+generics_basic.py:55: error: TypeVar constraint type cannot be parametrized by type variables  [misc] generics_basic.py:69: error: Value of type variable "AnyStr" of "concat" cannot be "Sequence[object]"  [type-var] generics_basic.py:121: error: Duplicate type variables in Generic[...] or Protocol[...]  [misc] generics_basic.py:157: error: Invalid index type "int" for "MyMap1[str, int]"; expected type "str"  [index]@@ -15,7 +16,6 @@ generics_basic.py:191: error: Type variable "generics_basic.T" is unbound  [vali generics_basic.py:191: note: (Hint: Use "Generic[T]" or "Protocol[T]" base class to bind "T" inside a class) generics_basic.py:191: note: (Hint: Use "T" in function signature to bind "T" inside a function) """-conformance_automated = "Fail"+conformance_automated = "Pass" errors_diff = """-Line 55: Expected 1 errors """diff --git a/conformance/results/mypy/version.toml b/conformance/results/mypy/version.tomlindex 51d97b4..59e0dd2 100644--- a/conformance/results/mypy/version.toml+++ b/conformance/results/mypy/version.toml@@ -1,2 +1,2 @@-version = "mypy 1.14.0+dev.499adaed8adbded1a180e30d071438fef81779ec"-test_duration = 2.4+version = "mypy 1.14.0+dev.841096633fe6255acb7840e4a7b0fce975b8ca24"+test_duration = 4.4

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@brianschubertbrianschubertforce-pushed theconformance-typevar-constraint-generic branch fromc467949 to8cc1aeeCompareNovember 25, 2024 17:33
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According tomypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅

@hauntsaninjahauntsaninja merged commit3268a7a intopython:masterDec 1, 2024
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@JukkaLJukkaLJukkaL left review comments

@hauntsaninjahauntsaninjahauntsaninja approved these changes

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