test-data/unit/check-fastparse.test

[case testFastParseSyntaxError]
1 +  # E: Expected an expression

[case testFastParseTypeCommentSyntaxError]
x = None # type: a : b  # E: Syntax error in type comment "a : b" \
                        # E: Invalid type comment or annotation

[case testFastParseInvalidTypeComment]
x = None # type: a + b  # E: Invalid type comment or annotation

-- Function type comments are attributed to the function def line.
-- This happens in both parsers.
[case testFastParseFunctionAnnotationSyntaxError]
def f():  # E: Syntax error in type comment "None -> None"
  # type: None -> None
  pass

[case testFastParseFunctionAnnotationSyntaxErrorSpaces]
def f():  # E: Syntax error in type comment "None -> None"
  # type:             None -> None
  pass

[case testFastParseInvalidFunctionAnnotation]
def f(x):  # E: Invalid type comment or annotation
  # type: (a + b) -> None
  pass

[case testFastParseInvalidTypes3]
# All of these should not crash
from typing import Callable, Tuple, Iterable

x: Tuple[int, str].x # E: Invalid type comment or annotation
a: Iterable[x].x # E: Invalid type comment or annotation
b: Tuple[x][x] # E: Invalid type comment or annotation
c: Iterable[x][x] # E: Invalid type comment or annotation
d: Callable[..., int][x] # E: Invalid type comment or annotation
e: Callable[..., int].x # E: Invalid type comment or annotation

f = None # type: Tuple[int, str].x # E: Invalid type comment or annotation
g = None # type: Iterable[x].x # E: Invalid type comment or annotation
h = None # type: Tuple[x][x] # E: Invalid type comment or annotation
i = None # type: Iterable[x][x] # E: Invalid type comment or annotation
j = None # type: Callable[..., int][x] # E: Invalid type comment or annotation
k = None # type: Callable[..., int].x # E: Invalid type comment or annotation

def f1(x: Tuple[int, str].x) -> None: pass # E: Invalid type comment or annotation
def f2(x: Iterable[x].x) -> None: pass # E: Invalid type comment or annotation
def f3(x: Tuple[x][x]) -> None: pass # E: Invalid type comment or annotation
def f4(x: Iterable[x][x]) -> None: pass # E: Invalid type comment or annotation
def f5(x: Callable[..., int][x]) -> None: pass # E: Invalid type comment or annotation
def f6(x: Callable[..., int].x) -> None: pass # E: Invalid type comment or annotation

[case testFastParseTypeWithIgnore]
def f(x,  # type: x  # type: ignore
      ):
    # type: (...) -> None
    pass

[case testFastParseVariableTypeWithIgnore]

x = 1 # type: str # type: ignore

[case testFastParseVariableTypeWithIgnoreNoSpace]

x = 1 # type: str #type:ignore

[case testFastParseVariableTypeWithIgnoreAndComment]

x = 1 # type: str # type: ignore # comment

[case testFastParseTypeWithIgnoreWithStmt]
with open('test', 'r') as f:  # type: int  # type: ignore
    pass

[case testFastParseTypeWithIgnoreForStmt]
for i in (1, 2, 3, 100):  # type: str # type: ignore
    pass
[builtins fixtures/tuple.pyi]

[case testFastParseVariableCommentThenIgnore]
a="test" # type: int #comment # type: ignore  # E: Incompatible types in assignment (expression has type "str", variable has type "int")

[case testFastParseProperty]

class C:
  @property
  def x(self) -> str: pass
  @x.setter
  def x(self, value: str) -> None: pass
[builtins fixtures/property.pyi]

[case testFastParseConditionalProperty]

class C:
  if bool():
    @property
    def x(self) -> str: pass
    @x.setter
    def x(self, value: str) -> None: pass
[builtins fixtures/property.pyi]

[case testFastParsePerArgumentAnnotations]
# flags: --implicit-optional

class A: pass
class B: pass
class C: pass
class D: pass
class E: pass
class F: pass
def f(a,        # type: A
      b = None, # type: B
      *args,    # type: C
      d = None, # type: D
      e,        # type: E
      **kwargs  # type: F
      ):
    reveal_type(a)      # N: Revealed type is "__main__.A"
    reveal_type(b)      # N: Revealed type is "__main__.B | None"
    reveal_type(args)   # N: Revealed type is "builtins.tuple[__main__.C, ...]"
    reveal_type(d)      # N: Revealed type is "__main__.D | None"
    reveal_type(e)      # N: Revealed type is "__main__.E"
    reveal_type(kwargs) # N: Revealed type is "builtins.dict[builtins.str, __main__.F]"
[builtins fixtures/dict.pyi]
[out]

[case testFastParsePerArgumentAnnotationsWithReturn]
# flags: --implicit-optional

class A: pass
class B: pass
class C: pass
class D: pass
class E: pass
class F: pass
def f(a,        # type: A
      b = None, # type: B
      *args,    # type: C
      d = None, # type: D
      e,        # type: E
      **kwargs  # type: F
      ):
      # type: (...) -> int
    reveal_type(a)      # N: Revealed type is "__main__.A"
    reveal_type(b)      # N: Revealed type is "__main__.B | None"
    reveal_type(args)   # N: Revealed type is "builtins.tuple[__main__.C, ...]"
    reveal_type(d)      # N: Revealed type is "__main__.D | None"
    reveal_type(e)      # N: Revealed type is "__main__.E"
    reveal_type(kwargs) # N: Revealed type is "builtins.dict[builtins.str, __main__.F]"
    return "not an int"  # E: Incompatible return value type (got "str", expected "int")
[builtins fixtures/dict.pyi]
[out]

-- New parser ignores this instead of failing loudly.
[case testFastParsePerArgumentAnnotationsWithAnnotatedBareStar_old_parser]
def f(*, # type: int  # E: Bare * has associated type comment
      x  # type: str
      ):
      # type: (...) -> int
    pass
[builtins fixtures/dict.pyi]
[out]

[case testFastParsePerArgumentAnnotationsWithReturnAndBareStar]

def f(*,
      x  # type: str
      ):
      # type: (...) -> int
    reveal_type(x) # N: Revealed type is "builtins.str"
    return "not an int"  # E: Incompatible return value type (got "str", expected "int")
[builtins fixtures/dict.pyi]
[out]

[case testFasterParseTooManyArgumentsAnnotation]
def f():  # E: Type signature has too many parameters
    # type: (int) -> None
    pass

f()
f(1) # E: Too many arguments for "f"

[case testFasterParseTooFewArgumentsAnnotation]
def f(x, y):  # E: Type signature has too few parameters
    # type: (int) -> None
    x()
    y()

f(1, 2)
f(1) # E: Missing positional argument "y" in call to "f"

[case testFasterParseTypeErrorCustom]

from typing import TypeVar, Generic
T = TypeVar('T')
class Foo(Generic[T]):
  pass

def f(a: Foo(int)) -> int:
    pass
[out]
main:7: error: Invalid type comment or annotation
main:7: note: Suggestion: use Foo[...] instead of Foo(...)

[case testFasterParseCallWithKeywordArgs]

def Foo(sort: bool) -> type:
    return int

def f(a: Foo(sort=True)) -> int:
    pass
[out]
main:5: error: Invalid type comment or annotation
main:5: note: Cannot use a function call in a type annotation

[case testFastParseMatMul]

from typing import Any
x = None  # type: Any
x @ 1
x @= 1

[case testFastParserShowsMultipleErrors]
def f(x):  # E: Type signature has too few parameters
    # type: () -> None
    pass
def g():  # E: Type signature has too many parameters
    # type: (int) -> None
    pass

[case testFastParseMalformedAssert]

assert 1, 2
assert (1, 2)  # E: Assertion is always true, perhaps remove parentheses?
assert (1, 2), 3  # E: Assertion is always true, perhaps remove parentheses?
assert (1,)  # E: Assertion is always true, perhaps remove parentheses?
assert ()
[builtins fixtures/tuple.pyi]

[case testFastParseAssertMessage]

assert 1
assert 1, 2
assert 1, 1+2
assert 1, 1+'test'  # E: Unsupported operand types for + ("int" and "str")
assert 1, f()  # E: Name "f" is not defined

[case testFastParserConsistentFunctionTypes]

def f1(x, y, z):
  # type: (int, int, int) -> int
  pass

def f2(x,  # type: int  # E: Function has duplicate type signatures
      y,  # type: int
      z   # type: int
    ):
    # type: (int, int, int) -> int
    pass

def f3(x,  # type: int
      y,  # type: int
      z   # type: int
    ):
    # type: (...) -> int
    pass

def f4(x, y, z):
  # type: (int, int, int) -> int
  pass

def f5(x) -> int:  # E: Function has duplicate type signatures
  # type: (int) -> int
  pass

def f6(x: int, y: int, z: int):
  # type: (...) -> int
  pass

def f7(x: int):  # E: Function has duplicate type signatures
  # type: (int) -> int
  pass

[case testFastParserDuplicateNames]
def f(x, y, z):
  pass

def g(x, y, x):  # E: Duplicate parameter "x" in function definition
  pass

def h(x, y, *x):  # E: Duplicate parameter "x" in function definition
  pass

def i(x, y, *z, **z):  # E: Duplicate parameter "z" in function definition
  pass

def j(x: int, y: int, *, x: int = 3):  # E: Duplicate parameter "x" in function definition
  pass

def k(*, y, z, y):  # E: Duplicate parameter "y" in function definition
  pass

lambda x, y, x: ...  # E: Duplicate parameter "x" in function definition
[builtins fixtures/tuple.pyi]

[case testNoCrashOnImportFromStar]
from pack import *
[file pack/__init__.py]
from . import *

[case testNoCrashOnImportFromStarNested]

import blamodule
[file blamodule/__init__.py]
from . import command
from . import backends

[file blamodule/backends/__init__.py]
from .Bla import Bla
Bla().method()

[file blamodule/backends/Bla.py]
from .. import *

class Bla:
    def method(self) -> str:
        return command.call()

[file blamodule/command.py]
def call() -> str: pass

[builtins fixtures/module.pyi]

[case testInvalidEscapeSequenceWarningsSuppressed]
# flags: --python-version 3.15
# Test that SyntaxWarnings for invalid escape sequences are suppressed
# when parsing potential type expressions containing regex patterns or
# similar strings. Callable arguments are always potential type expressions.
from typing import TypeForm

def identity(typx: TypeForm) -> TypeForm:
    return typx

# This should not generate SyntaxWarning despite invalid escape sequence
identity(r"re\.match")  # E: Argument 1 to "identity" has incompatible type "str"; expected "TypeForm[Any]"
[builtins fixtures/tuple.pyi]
[typing fixtures/typing-full.pyi]