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Improve error message for incompatible **kwargs argument #21129

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Improve error message for incompatible **kwargs argument
yourlocaljosh Apr 1, 2026
62fc87b
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Apr 1, 2026
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[pre-commit.ci] auto fixes from pre-commit.com hooks 
for more information, see https://pre-commit.ci
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pre-commit-ci[bot] committed Apr 1, 2026
commit 62fc87b976f3a53168c89574fabb188aced563b1
18 changes: 9 additions & 9 deletions test-data/unit/check-tuples.test
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Expand Up @@ -1593,27 +1593,27 @@ from typing import Tuple
t: Tuple[int, ...] = (1, 2, 3, 4, 5, 6, 7, 8, "str", "str", "str", 11) # E: Incompatible types in assignment (3 tuple items are incompatible) \
# N: Expression tuple item 8 has type "str"; "int" expected; \
# N: Expression tuple item 9 has type "str"; "int" expected; \
# N: Expression tuple item 10 has type "str"; "int" expected;
# N: Expression tuple item 10 has type "str"; "int" expected;

# long initializer assignment with more mismatches
t1: Tuple[int, ...] = (1, 2, 3, 4, 5, 6, 7, 8, "str", "str", "str", "str") # E: Incompatible types in assignment (4 tuple items are incompatible; 1 items are omitted) \
# N: Expression tuple item 8 has type "str"; "int" expected; \
# N: Expression tuple item 9 has type "str"; "int" expected; \
# N: Expression tuple item 10 has type "str"; "int" expected;
# N: Expression tuple item 10 has type "str"; "int" expected;

# short tuple initializer assignment
t2: Tuple[int, ...] = (1, 2, "s", 4) # E: Incompatible types in assignment (expression has type "tuple[int, int, str, int]", variable has type "tuple[int, ...]")

# long initializer assignment with few mismatches, no ellipsis
t3: Tuple[int, int, int, int, int, int, int, int, int, int, int, int] = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, "str", "str") # E: Incompatible types in assignment (2 tuple items are incompatible) \
# N: Expression tuple item 10 has type "str"; "int" expected; \
# N: Expression tuple item 11 has type "str"; "int" expected;
# N: Expression tuple item 11 has type "str"; "int" expected;

# long initializer assignment with more mismatches, no ellipsis
t4: Tuple[int, int, int, int, int, int, int, int, int, int, int, int] = (1, 2, 3, 4, 5, 6, 7, 8, "str", "str", "str", "str") # E: Incompatible types in assignment (4 tuple items are incompatible; 1 items are omitted) \
# N: Expression tuple item 8 has type "str"; "int" expected; \
# N: Expression tuple item 9 has type "str"; "int" expected; \
# N: Expression tuple item 10 has type "str"; "int" expected;
# N: Expression tuple item 10 has type "str"; "int" expected;

# short tuple initializer assignment, no ellipsis
t5: Tuple[int, int] = (1, 2, "s", 4) # E: Incompatible types in assignment (expression has type "tuple[int, int, str, int]", variable has type "tuple[int, int]")
Expand Down Expand Up @@ -1668,9 +1668,9 @@ class A:
)
[out]
main:18: error: Incompatible return value type (6 tuple items are incompatible; 3 items are omitted)
main:18: note: Expression tuple item 6 has type "str | int"; "str" expected;
main:18: note: Expression tuple item 7 has type "str | float"; "str" expected;
main:18: note: Expression tuple item 8 has type "str | None"; "str" expected;
main:18: note: Expression tuple item 6 has type "str | int"; "str" expected;
main:18: note: Expression tuple item 7 has type "str | float"; "str" expected;
main:18: note: Expression tuple item 8 has type "str | None"; "str" expected;
[builtins fixtures/property.pyi]

[case testPropertyLongTupleReturnTypeMismatchUnionWiderExpected]
Expand Down Expand Up @@ -1707,8 +1707,8 @@ class A:
)
[out]
main:18: error: Incompatible return value type (2 tuple items are incompatible)
main:18: note: Expression tuple item 2 has type "str"; "int" expected;
main:18: note: Expression tuple item 11 has type "float | int"; "str" expected;
main:18: note: Expression tuple item 2 has type "str"; "int" expected;
main:18: note: Expression tuple item 11 has type "float | int"; "str" expected;
[builtins fixtures/property.pyi]

[case testTupleWithStarExpr]
Expand Down
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