test-data/unit/check-python310.test

-- Capture Pattern --
[case testCapturePatternType]
class A: ...
m: A

match m:
    case a:
        reveal_type(a)  # N: Revealed type is "__main__.A"


-- Literal Pattern --
[case testLiteralPatternNarrows]
m: object

match m:
    case 1:
        reveal_type(m)  # N: Revealed type is "Literal[1]?"

[case testLiteralPatternAlreadyNarrower]
m: bool

match m:
    case 1:
        reveal_type(m)  # N: Revealed type is "builtins.bool"

[case testLiteralPatternUnreachable]
# primitives are needed because otherwise mypy doesn't see that int and str are incompatible
m: int

match m:
    case "str":
        reveal_type(m)
[builtins fixtures/primitives.pyi]


-- Value Pattern --
[case testValuePatternNarrows]
import b
m: object

match m:
    case b.b:
        reveal_type(m)  # N: Revealed type is "builtins.int"
[file b.py]
b: int

[case testValuePatternAlreadyNarrower]
import b
m: bool

match m:
    case b.b:
        reveal_type(m)  # N: Revealed type is "builtins.bool"
[file b.py]
b: int

[case testValuePatternIntersect]
import b

class A: ...
m: A

match m:
    case b.b:
        reveal_type(m)  # N: Revealed type is "__main__.<subclass of "A" and "B">"
[file b.py]
class B: ...
b: B

[case testValuePatternUnreachable]
# primitives are needed because otherwise mypy doesn't see that int and str are incompatible
import b

m: int

match m:
    case b.b:
        reveal_type(m)
[file b.py]
b: str
[builtins fixtures/primitives.pyi]


-- Sequence Pattern --
[case testSequencePatternCaptures]
from typing import List
m: List[int]

match m:
    case [a]:
        reveal_type(a)  # N: Revealed type is "builtins.int*"
[builtins fixtures/list.pyi]

[case testSequencePatternCapturesStarred]
from typing import Sequence
m: Sequence[int]

match m:
    case [a, *b]:
        reveal_type(a)  # N: Revealed type is "builtins.int*"
        reveal_type(b)  # N: Revealed type is "builtins.list[builtins.int*]"
[builtins fixtures/list.pyi]

[case testSequencePatternNarrowsInner]
from typing import Sequence
m: Sequence[object]

match m:
    case [1, True]:
        reveal_type(m)  # N: Revealed type is "typing.Sequence[builtins.int]"

[case testSequencePatternNarrowsOuter]
from typing import Sequence
m: object

match m:
    case [1, True]:
        reveal_type(m)  # N: Revealed type is "typing.Sequence[builtins.int]"

[case testSequencePatternAlreadyNarrowerInner]
from typing import Sequence
m: Sequence[bool]

match m:
    case [1, True]:
        reveal_type(m)  # N: Revealed type is "typing.Sequence[builtins.bool]"

[case testSequencePatternAlreadyNarrowerOuter]
from typing import Sequence
m: Sequence[object]

match m:
    case [1, True]:
        reveal_type(m)  # N: Revealed type is "typing.Sequence[builtins.int]"

[case testSequencePatternAlreadyNarrowerBoth]
from typing import Sequence
m: Sequence[bool]

match m:
    case [1, True]:
        reveal_type(m)  # N: Revealed type is "typing.Sequence[builtins.bool]"

[case testNestedSequencePatternNarrowsInner]
from typing import Sequence
m: Sequence[Sequence[object]]

match m:
    case [[1], [True]]:
        reveal_type(m)  # N: Revealed type is "typing.Sequence[typing.Sequence[builtins.int]]"

[case testNestedSequencePatternNarrowsOuter]
from typing import Sequence
m: object

match m:
    case [[1], [True]]:
        reveal_type(m)  # N: Revealed type is "typing.Sequence[typing.Sequence[builtins.int]]"

[case testSequencePatternDoesntNarrowInvariant]
from typing import List
m: List[object]

match m:
    case [1]:
        reveal_type(m)  # N: Revealed type is "builtins.list[builtins.object]"
[builtins fixtures/list.pyi]

[case testSequencePatternMatches]
import array, collections
from typing import Sequence, Iterable

m1: object
m2: Sequence[int]
m3: array.array[int]
m4: collections.deque[int]
m5: list[int]
m6: memoryview
m7: range
m8: tuple[int]

m9: str
m10: bytes
m11: bytearray

match m1:
    case [a]:
        reveal_type(a)  # N: Revealed type is "builtins.object"

match m2:
    case [b]:
        reveal_type(b)  # N: Revealed type is "builtins.int*"

match m3:
    case [c]:
        reveal_type(c)  # N: Revealed type is "builtins.int*"

match m4:
    case [d]:
        reveal_type(d)  # N: Revealed type is "builtins.int*"

match m5:
    case [e]:
        reveal_type(e)  # N: Revealed type is "builtins.int*"

match m6:
    case [f]:
        reveal_type(f)  # N: Revealed type is "builtins.int*"

match m7:
    case [g]:
        reveal_type(g)  # N: Revealed type is "builtins.int*"

match m8:
    case [h]:
        reveal_type(h)  # N: Revealed type is "builtins.int"

match m9:
    case [i]:
        reveal_type(i)

match m10:
    case [j]:
        reveal_type(j)

match m11:
    case [k]:
        reveal_type(k)
[builtins fixtures/primitives.pyi]
[typing fixtures/typing-full.pyi]


[case testSequencePatternCapturesTuple]
from typing import Tuple
m: Tuple[int, str, bool]

match m:
    case [a, b, c]:
        reveal_type(a)  # N: Revealed type is "builtins.int"
        reveal_type(b)  # N: Revealed type is "builtins.str"
        reveal_type(c)  # N: Revealed type is "builtins.bool"
        reveal_type(m)  # N: Revealed type is "Tuple[builtins.int, builtins.str, builtins.bool]"
[builtins fixtures/list.pyi]

[case testSequencePatternTupleTooLong]
from typing import Tuple
m: Tuple[int, str]

match m:
    case [a, b, c]:
        reveal_type(a)
        reveal_type(b)
        reveal_type(c)
[builtins fixtures/list.pyi]

[case testSequencePatternTupleTooShort]
from typing import Tuple
m: Tuple[int, str, bool]

match m:
    case [a, b]:
        reveal_type(a)
        reveal_type(b)
[builtins fixtures/list.pyi]

[case testSequencePatternTupleNarrows]
from typing import Tuple
m: Tuple[object, object]

match m:
    case [1, "str"]:
        reveal_type(m)  # N: Revealed type is "Tuple[Literal[1]?, Literal['str']?]"
[builtins fixtures/list.pyi]

[case testSequencePatternTupleStarred]
from typing import Tuple
m: Tuple[int, str, bool]

match m:
    case [a, *b, c]:
        reveal_type(a)  # N: Revealed type is "builtins.int"
        reveal_type(b)  # N: Revealed type is "builtins.list[builtins.str]"
        reveal_type(c)  # N: Revealed type is "builtins.bool"
        reveal_type(m)  # N: Revealed type is "Tuple[builtins.int, builtins.str, builtins.bool]"
[builtins fixtures/list.pyi]

[case testSequencePatternTupleStarredUnion]
from typing import Tuple
m: Tuple[int, str, float, bool]

match m:
    case [a, *b, c]:
        reveal_type(a)  # N: Revealed type is "builtins.int"
        reveal_type(b)  # N: Revealed type is "builtins.list[Union[builtins.str, builtins.float]]"
        reveal_type(c)  # N: Revealed type is "builtins.bool"
        reveal_type(m)  # N: Revealed type is "Tuple[builtins.int, builtins.str, builtins.float, builtins.bool]"
[builtins fixtures/list.pyi]


[case testSequencePatternTupleStarredTooShort]
from typing import Tuple
m: Tuple[int]
reveal_type(m)  # N: Revealed type is "Tuple[builtins.int]"

match m:
    case [a, *b, c]:
        reveal_type(a)
        reveal_type(b)
        reveal_type(c)
[builtins fixtures/list.pyi]

[case testNonMatchingSequencePattern]
from typing import List

x: List[int]
match x:
    case [str()]:
        pass

[case testSequenceUnion-skip]
from typing import List, Union
m: Union[List[List[str]], str]

match m:
    case [list(['str'])]:
        reveal_type(m)  # N: Revealed type is "builtins.list[builtins.list[builtins.str]]"
[builtins fixtures/list.pyi]

-- Mapping Pattern --
[case testMappingPatternCaptures]
from typing import Dict
import b
m: Dict[str, int]

match m:
    case {"key": v}:
        reveal_type(v)  # N: Revealed type is "builtins.int*"
    case {b.b: v2}:
        reveal_type(v2)  # N: Revealed type is "builtins.int*"
[file b.py]
b: str
[builtins fixtures/dict.pyi]

[case testMappingPatternCapturesWrongKeyType]
# This is not actually unreachable, as a subclass of dict could accept keys with different types
from typing import Dict
import b
m: Dict[str, int]

match m:
    case {1: v}:
        reveal_type(v)  # N: Revealed type is "builtins.int*"
    case {b.b: v2}:
        reveal_type(v2)  # N: Revealed type is "builtins.int*"
[file b.py]
b: int
[builtins fixtures/dict.pyi]

[case testMappingPatternCapturesTypedDict]
from typing import TypedDict

class A(TypedDict):
    a: str
    b: int

m: A

match m:
    case {"a": v}:
        reveal_type(v)  # N: Revealed type is "builtins.str"
    case {"b": v2}:
        reveal_type(v2)  # N: Revealed type is "builtins.int"
    case {"a": v3, "b": v4}:
        reveal_type(v3)  # N: Revealed type is "builtins.str"
        reveal_type(v4)  # N: Revealed type is "builtins.int"
    case {"o": v5}:
        reveal_type(v5)  # N: Revealed type is "builtins.object*"
[typing fixtures/typing-typeddict.pyi]

[case testMappingPatternCapturesTypedDictWithLiteral]
from typing import TypedDict
import b

class A(TypedDict):
    a: str
    b: int

m: A

match m:
    case {b.a: v}:
        reveal_type(v)  # N: Revealed type is "builtins.str"
    case {b.b: v2}:
        reveal_type(v2)  # N: Revealed type is "builtins.int"
    case {b.a: v3, b.b: v4}:
        reveal_type(v3)  # N: Revealed type is "builtins.str"
        reveal_type(v4)  # N: Revealed type is "builtins.int"
    case {b.o: v5}:
        reveal_type(v5)  # N: Revealed type is "builtins.object*"
[file b.py]
from typing import Final, Literal
a: Final = "a"
b: Literal["b"] = "b"
o: Final[str] = "o"
[typing fixtures/typing-typeddict.pyi]

[case testMappingPatternCapturesTypedDictWithNonLiteral]
from typing import TypedDict
import b

class A(TypedDict):
    a: str
    b: int

m: A

match m:
    case {b.a: v}:
        reveal_type(v)  # N: Revealed type is "builtins.object*"
[file b.py]
from typing import Final, Literal
a: str
[typing fixtures/typing-typeddict.pyi]

[case testMappingPatternCapturesTypedDictUnreachable]
# TypedDict keys are always str, so this is actually unreachable
from typing import TypedDict
import b

class A(TypedDict):
    a: str
    b: int

m: A

match m:
    case {1: v}:
        reveal_type(v)
    case {b.b: v2}:
        reveal_type(v2)
[file b.py]
b: int
[typing fixtures/typing-typeddict.pyi]

[case testMappingPatternCaptureRest]
m: object

match m:
    case {'k': 1, **r}:
        reveal_type(r)  # N: Revealed type is "builtins.dict[builtins.object, builtins.object]"
[builtins fixtures/dict.pyi]

[case testMappingPatternCaptureRestFromMapping]
from typing import Mapping

m: Mapping[str, int]

match m:
    case {'k': 1, **r}:
        reveal_type(r)  # N: Revealed type is "builtins.dict[builtins.str*, builtins.int*]"
[builtins fixtures/dict.pyi]

-- Mapping patterns currently don't narrow --

-- Class Pattern --
[case testClassPatternCapturePositional]
from typing import Final

class A:
    __match_args__: Final = ("a", "b")
    a: str
    b: int

m: A

match m:
    case A(i, j):
        reveal_type(i)  # N: Revealed type is "builtins.str"
        reveal_type(j)  # N: Revealed type is "builtins.int"
[builtins fixtures/tuple.pyi]

[case testClassPatternMemberClassCapturePositional]
import b

m: b.A

match m:
    case b.A(i, j):
        reveal_type(i)  # N: Revealed type is "builtins.str"
        reveal_type(j)  # N: Revealed type is "builtins.int"
[file b.py]
from typing import Final

class A:
    __match_args__: Final = ("a", "b")
    a: str
    b: int
[builtins fixtures/tuple.pyi]

[case testClassPatternCaptureKeyword]
class A:
    a: str
    b: int

m: A

match m:
    case A(a=i, b=j):
        reveal_type(i)  # N: Revealed type is "builtins.str"
        reveal_type(j)  # N: Revealed type is "builtins.int"

[case testClassPatternCaptureSelf]
m: object

match m:
    case bool(a):
        reveal_type(a)  # N: Revealed type is "builtins.bool"
    case bytearray(b):
        reveal_type(b)  # N: Revealed type is "builtins.bytearray"
    case bytes(c):
        reveal_type(c)  # N: Revealed type is "builtins.bytes"
    case dict(d):
        reveal_type(d)  # N: Revealed type is "builtins.dict[Any, Any]"
    case float(e):
        reveal_type(e)  # N: Revealed type is "builtins.float"
    case frozenset(f):
        reveal_type(f)  # N: Revealed type is "builtins.frozenset[Any]"
    case int(g):
        reveal_type(g)  # N: Revealed type is "builtins.int"
    case list(h):
        reveal_type(h)  # N: Revealed type is "builtins.list[Any]"
    case set(i):
        reveal_type(i)  # N: Revealed type is "builtins.set[Any]"
    case str(j):
        reveal_type(j)  # N: Revealed type is "builtins.str"
    case tuple(k):
        reveal_type(k)  # N: Revealed type is "builtins.tuple[Any, ...]"
[builtins fixtures/primitives.pyi]

[case testClassPatternNarrowSelfCapture]
m: object

match m:
    case bool():
        reveal_type(m)  # N: Revealed type is "builtins.bool"
    case bytearray():
        reveal_type(m)  # N: Revealed type is "builtins.bytearray"
    case bytes():
        reveal_type(m)  # N: Revealed type is "builtins.bytes"
    case dict():
        reveal_type(m)  # N: Revealed type is "builtins.dict[Any, Any]"
    case float():
        reveal_type(m)  # N: Revealed type is "builtins.float"
    case frozenset():
        reveal_type(m)  # N: Revealed type is "builtins.frozenset[Any]"
    case int():
        reveal_type(m)  # N: Revealed type is "builtins.int"
    case list():
        reveal_type(m)  # N: Revealed type is "builtins.list[Any]"
    case set():
        reveal_type(m)  # N: Revealed type is "builtins.set[Any]"
    case str():
        reveal_type(m)  # N: Revealed type is "builtins.str"
    case tuple():
        reveal_type(m)  # N: Revealed type is "builtins.tuple[Any, ...]"
[builtins fixtures/primitives.pyi]

[case testClassPatternCaptureDataclass]
from dataclasses import dataclass

@dataclass
class A:
    a: str
    b: int

m: A

match m:
    case A(i, j):
        reveal_type(i)  # N: Revealed type is "builtins.str"
        reveal_type(j)  # N: Revealed type is "builtins.int"
[builtins fixtures/dataclasses.pyi]

[case testClassPatternCaptureDataclassNoMatchArgs]
from dataclasses import dataclass

@dataclass(match_args=False)
class A:
    a: str
    b: int

m: A

match m:
    case A(i, j):  # E: Class "__main__.A" doesn't define "__match_args__"
        pass
[builtins fixtures/dataclasses.pyi]

[case testClassPatternCaptureDataclassPartialMatchArgs]
from dataclasses import dataclass, field

@dataclass
class A:
    a: str
    b: int = field(init=False)

m: A

match m:
    case A(i, j):  # E: Too many positional patterns for class pattern
        pass
    case A(k):
        reveal_type(k)  # N: Revealed type is "builtins.str"
[builtins fixtures/dataclasses.pyi]

[case testClassPatternCaptureNamedTupleInline]
from collections import namedtuple

A = namedtuple("A", ["a", "b"])

m: A

match m:
    case A(i, j):
        reveal_type(i)  # N: Revealed type is "Any"
        reveal_type(j)  # N: Revealed type is "Any"
[builtins fixtures/list.pyi]

[case testClassPatternCaptureNamedTupleInlineTyped]
from typing import NamedTuple

A = NamedTuple("A", [("a", str), ("b", int)])

m: A

match m:
    case A(i, j):
        reveal_type(i)  # N: Revealed type is "builtins.str"
        reveal_type(j)  # N: Revealed type is "builtins.int"
[builtins fixtures/list.pyi]

[case testClassPatternCaptureNamedTupleClass]
from typing import NamedTuple

class A(NamedTuple):
    a: str
    b: int

m: A

match m:
    case A(i, j):
        reveal_type(i)  # N: Revealed type is "builtins.str"
        reveal_type(j)  # N: Revealed type is "builtins.int"
[builtins fixtures/tuple.pyi]

[case testClassPatternCaptureGeneric]
from typing import Generic, TypeVar

T = TypeVar('T')

class A(Generic[T]):
    a: T

m: object

match m:
    case A(a=i):
        reveal_type(m)  # N: Revealed type is "__main__.A[Any]"
        reveal_type(i)  # N: Revealed type is "Any"

[case testClassPatternCaptureGenericAlreadyKnown]
from typing import Generic, TypeVar

T = TypeVar('T')

class A(Generic[T]):
    a: T

m: A[int]

match m:
    case A(a=i):
        reveal_type(m)  # N: Revealed type is "__main__.A[builtins.int]"
        reveal_type(i)  # N: Revealed type is "builtins.int*"

[case testClassPatternCaptureFilledGenericTypeAlias]
from typing import Generic, TypeVar

T = TypeVar('T')

class A(Generic[T]):
    a: T

B = A[int]

m: object

match m:
    case B(a=i):  # E: Class pattern class must not be a type alias with type parameters
        reveal_type(i)

[case testClassPatternCaptureGenericTypeAlias]
from typing import Generic, TypeVar

T = TypeVar('T')

class A(Generic[T]):
    a: T

B = A

m: object

match m:
    case B(a=i):
        pass

[case testClassPatternNarrows]
from typing import Final

class A:
    __match_args__: Final = ("a", "b")
    a: str
    b: int

m: object

match m:
    case A():
        reveal_type(m)  # N: Revealed type is "__main__.A"
    case A(i, j):
        reveal_type(m)  # N: Revealed type is "__main__.A"
[builtins fixtures/tuple.pyi]

[case testClassPatternNarrowsUnion]
from typing import Final, Union

class A:
    __match_args__: Final = ("a", "b")
    a: str
    b: int

class B:
    __match_args__: Final = ("a", "b")
    a: int
    b: str

m: Union[A, B]

match m:
    case A():
        reveal_type(m)  # N: Revealed type is "__main__.A"

match m:
    case A(i, j):
        reveal_type(m)  # N: Revealed type is "__main__.A"
        reveal_type(i)  # N: Revealed type is "builtins.str"
        reveal_type(j)  # N: Revealed type is "builtins.int"

match m:
    case B():
        reveal_type(m)  # N: Revealed type is "__main__.B"

match m:
    case B(k, l):
        reveal_type(m)  # N: Revealed type is "__main__.B"
        reveal_type(k)  # N: Revealed type is "builtins.int"
        reveal_type(l)  # N: Revealed type is "builtins.str"
[builtins fixtures/tuple.pyi]

[case testClassPatternAlreadyNarrower]
from typing import Final

class A:
    __match_args__: Final = ("a", "b")
    a: str
    b: int
class B(A): ...

m: B

match m:
    case A():
        reveal_type(m)  # N: Revealed type is "__main__.B"

match m:
    case A(i, j):
        reveal_type(m)  # N: Revealed type is "__main__.B"
[builtins fixtures/tuple.pyi]

[case testClassPatternIntersection]
from typing import Final

class A:
    __match_args__: Final = ("a", "b")
    a: str
    b: int
class B: ...

m: B

match m:
    case A():
        reveal_type(m)  # N: Revealed type is "__main__.<subclass of "B" and "A">"
    case A(i, j):
        reveal_type(m)  # N: Revealed type is "__main__.<subclass of "B" and "A">1"
[builtins fixtures/tuple.pyi]

[case testClassPatternNonexistentKeyword]
class A: ...

m: object

match m:
    case A(a=j):  # E: Class "__main__.A" has no attribute "a"
        reveal_type(m)  # N: Revealed type is "__main__.A"
        reveal_type(j)  # N: Revealed type is "Any"

[case testClassPatternDuplicateKeyword]
class A:
    a: str

m: object

match m:
    case A(a=i, a=j):  # E: Duplicate keyword pattern "a"
        pass

[case testClassPatternDuplicateImplicitKeyword]
from typing import Final

class A:
    __match_args__: Final = ("a",)
    a: str

m: object

match m:
    case A(i, a=j):  # E: Keyword "a" already matches a positional pattern
        pass
[builtins fixtures/tuple.pyi]

[case testClassPatternTooManyPositionals]
from typing import Final

class A:
    __match_args__: Final = ("a", "b")
    a: str
    b: int

m: object

match m:
    case A(i, j, k):  # E: Too many positional patterns for class pattern
        pass
[builtins fixtures/tuple.pyi]

[case testClassPatternIsNotType]
a = 1
m: object

match m:
    case a(i, j):  # E: Expected type in class pattern; found "builtins.int"
        reveal_type(i)
        reveal_type(j)

[case testClassPatternNestedGenerics]
# From cpython test_patma.py
x = [[{0: 0}]]
match x:
    case list([({-0-0j: int(real=0+0j, imag=0-0j) | (1) as z},)]):
        y = 0

reveal_type(x)  # N: Revealed type is "builtins.list[builtins.list*[builtins.dict*[builtins.int*, builtins.int*]]]"
reveal_type(y)  # N: Revealed type is "builtins.int"
reveal_type(z)  # N: Revealed type is "builtins.int*"
[builtins fixtures/dict.pyi]

[case testNonFinalMatchArgs]
class A:
    __match_args__ = ("a", "b")  # N: __match_args__ must be final for checking of match statements to work
    a: str
    b: int

m: object

match m:
    case A(i, j):
        reveal_type(i)  # N: Revealed type is "Any"
        reveal_type(j)  # N: Revealed type is "Any"
[builtins fixtures/tuple.pyi]

[case testAnyTupleMatchArgs]
from typing import Tuple, Any

class A:
    __match_args__: Tuple[Any, ...]
    a: str
    b: int

m: object

match m:
    case A(i, j, k):
        reveal_type(i)  # N: Revealed type is "Any"
        reveal_type(j)  # N: Revealed type is "Any"
        reveal_type(k)  # N: Revealed type is "Any"
[builtins fixtures/tuple.pyi]

[case testNonLiteralMatchArgs]
from typing import Final

b: str = "b"
class A:
    __match_args__: Final = ("a", b)  # N: __match_args__ must be a tuple containing string literals for checking of match statements to work
    a: str
    b: int

m: object

match m:
    case A(i, j, k):  # E: Too many positional patterns for class pattern
        pass
    case A(i, j):
        reveal_type(i)  # N: Revealed type is "builtins.str"
        reveal_type(j)  # N: Revealed type is "Any"
[builtins fixtures/tuple.pyi]

[case testExternalMatchArgs]
from typing import Final, Literal

args: Final = ("a", "b")
class A:
    __match_args__: Final = args
    a: str
    b: int

arg: Final = "a"
arg2: Literal["b"] = "b"
class B:
    __match_args__: Final = (arg, arg2)
    a: str
    b: int

[builtins fixtures/tuple.pyi]
[typing fixtures/typing-medium.pyi]


-- As Pattern --
[case testAsPattern]
m: int

match m:
    case x as l:
        reveal_type(x)  # N: Revealed type is "builtins.int"
        reveal_type(l)  # N: Revealed type is "builtins.int"

[case testAsPatternNarrows]
m: object

match m:
    case int() as l:
        reveal_type(l)  # N: Revealed type is "builtins.int"

[case testAsPatternCapturesOr]
m: object

match m:
    case 1 | 2 as n:
        reveal_type(n)  # N: Revealed type is "Union[Literal[1]?, Literal[2]?]"

[case testAsPatternAlreadyNarrower]
m: bool

match m:
    case int() as l:
        reveal_type(l)  # N: Revealed type is "builtins.bool"


-- Or Pattern --
[case testOrPatternNarrows]
m: object

match m:
    case 1 | 2:
        reveal_type(m)  # N: Revealed type is "Union[Literal[1]?, Literal[2]?]"

[case testOrPatternNarrowsStr]
m: object

match m:
    case "foo" | "bar":
        reveal_type(m)  # N: Revealed type is "Union[Literal['foo']?, Literal['bar']?]"

[case testOrPatternNarrowsUnion]
m: object

match m:
    case 1 | "foo":
        reveal_type(m)  # N: Revealed type is "Union[Literal[1]?, Literal['foo']?]"

[case testOrPatterCapturesMissing]
from typing import List
m: List[int]

match m:
    case [x, y] | list(x):  # E: Alternative patterns bind different names
        reveal_type(x)  # N: Revealed type is "builtins.object"
        reveal_type(y)  # N: Revealed type is "builtins.int*"
[builtins fixtures/list.pyi]

[case testOrPatternCapturesJoin]
m: object

match m:
    case list(x) | dict(x):
        reveal_type(x)  # N: Revealed type is "typing.Iterable[Any]"
[builtins fixtures/dict.pyi]


-- Interactions --
[case testCapturePatternMultipleCases]
m: object

match m:
    case int(x):
        reveal_type(x)  # N: Revealed type is "builtins.int"
    case str(x):
        reveal_type(x)  # N: Revealed type is "builtins.str"

reveal_type(x)  # N: Revealed type is "Union[builtins.int, builtins.str]"

[case testCapturePatternMultipleCaptures]
from typing import Iterable

m: Iterable[int]

match m:
    case [x, x]:  # E: Multiple assignments to name "x" in pattern
        reveal_type(x)  # N: Revealed type is "builtins.int"
[builtins fixtures/list.pyi]

[case testCapturePatternPreexistingSame]
a: int
m: int

match m:
    case a:
        reveal_type(a)  # N: Revealed type is "builtins.int"

[case testCapturePatternPreexistingIncompatible]
a: str
m: int

match m:
    case a:  # E: Incompatible types in capture pattern (pattern captures type "int", variable has type "str")
        reveal_type(a)  # N: Revealed type is "builtins.str"

[case testCapturePatternPreexistingIncompatibleLater]
a: str
m: object

match m:
    case str(a):
        reveal_type(a)  # N: Revealed type is "builtins.str"
    case int(a):  # E: Incompatible types in capture pattern (pattern captures type "int", variable has type "str")
        reveal_type(a)  # N: Revealed type is "builtins.str"


-- Guards --
[case testSimplePatternGuard]
m: str

def guard() -> bool: ...

match m:
    case a if guard():
        reveal_type(a)  # N: Revealed type is "builtins.str"

[case testAlwaysTruePatternGuard]
m: str

match m:
    case a if True:
        reveal_type(a)  # N: Revealed type is "builtins.str"

[case testAlwaysFalsePatternGuard]
m: str

match m:
    case a if False:
        reveal_type(a)

[case testRedefiningPatternGuard]
# flags: --strict-optional
m: str

match m:
    case a if a := 1:  # E: Incompatible types in assignment (expression has type "int", variable has type "str")
        reveal_type(a)  # N: Revealed type is "<nothing>"

[case testAssigningPatternGuard]
m: str

match m:
    case a if a := "test":
        reveal_type(a)  # N: Revealed type is "builtins.str"

[case testNarrowingPatternGuard]
m: object

match m:
    case a if isinstance(a, str):
        reveal_type(a)  # N: Revealed type is "builtins.str"
[builtins fixtures/isinstancelist.pyi]

[case testIncompatiblePatternGuard]
class A: ...
class B: ...

m: A

match m:
    case a if isinstance(a, B):
        reveal_type(a)  # N: Revealed type is "__main__.<subclass of "A" and "B">"
[builtins fixtures/isinstancelist.pyi]

[case testUnreachablePatternGuard]
m: str

match m:
    case a if isinstance(a, int):
        reveal_type(a)
[builtins fixtures/isinstancelist.pyi]

-- Exhaustiveness --
[case testUnionNegativeNarrowing-skip]
from typing import Union

m: Union[str, int]

match m:
    case str(a):
        reveal_type(a)  # N: Revealed type is "builtins.str"
        reveal_type(m)  # N: Revealed type is "builtins.str"
    case b:
        reveal_type(b)  # N: Revealed type is "builtins.int"
        reveal_type(m)  # N: Revealed type is "builtins.int"

[case testOrPatternNegativeNarrowing-skip]
from typing import Union

m: Union[str, bytes, int]

match m:
    case str(a) | bytes(a):
        reveal_type(a)  # N: Revealed type is "builtins.object"
        reveal_type(m)  # N: Revealed type is "Union[builtins.str, builtins.bytes]"
    case b:
        reveal_type(b)  # N: Revealed type is "builtins.int"

[case testExhaustiveReturn-skip]
def foo(value) -> int:
  match value:
    case "bar":
      return 1
    case _:
      return 2

[case testNoneExhaustiveReturn-skip]
def foo(value) -> int:  # E: Missing return statement
  match value:
    case "bar":
      return 1
    case 2:
      return 2