cython

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# mode: run
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# tag: pep484, warnings, pure3.6
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# ticket: 5643
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# cython: language_level=3
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try:
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    from typing import Optional
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except ImportError:
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    pass
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# no crash
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def gh5643_optional(a: Optional[int] = None):
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    """
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    >>> gh5643_optional()
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    True
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    >>> gh5643_optional(1)
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    False
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    """
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    return a is None
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# no crash
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def gh5643_int_untyped(a: int = 1, b = None):
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    """
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    >>> gh5643_int_untyped(2)
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    (False, True)
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    >>> gh5643_int_untyped(2, None)
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    (False, True)
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    >>> gh5643_int_untyped(1, 3)
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    (True, False)
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    """
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    return a == 1, b is None
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# used to crash
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def gh5643_int_int_none(a: int = 1, b: int = None):  # should warn about missing "Optional[]"
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    """
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    >>> gh5643_int_int_none()
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    (True, True)
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    >>> gh5643_int_int_none(2, 3)
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    (False, False)
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    """
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    return a == 1, b is None
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def gh5643_int_int_integer(a: int = 1, b: int = 3):
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    """
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    >>> gh5643_int_int_integer()
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    (True, True)
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    >>> gh5643_int_int_integer(2, 3)
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    (False, True)
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    """
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    return a == 1, b == 3
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# used to crash
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def gh5643_int_optional_none(a: int = 1, b: Optional[int] = None):
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    """
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    >>> gh5643_int_optional_none()
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    (True, True)
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    >>> gh5643_int_optional_none(2)
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    (False, True)
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    >>> gh5643_int_optional_none(2, 3)
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    (False, False)
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    """
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    return a == 1, b is None
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def gh5643_int_optional_integer(a: int = 1, b: Optional[int] = 2):
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    """
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    >>> gh5643_int_optional_integer()
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    (True, True)
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    >>> gh5643_int_optional_integer(2)
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    (False, True)
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    >>> gh5643_int_optional_integer(2, 3)
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    (False, False)
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    >>> gh5643_int_optional_integer(2, 2)
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    (False, True)
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    """
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    return a == 1, b == 2
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_WARNINGS = """
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37:36: PEP-484 recommends 'typing.Optional[...]' for arguments that can be None.
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"""
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