| 1 | # Stripped down version of typing.py for runtime support only!
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| 2 | #
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| 3 | # We got rid of runtime dependences on collections.py, copy.py, etc.
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| 4 | #
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| 5 | # MyPy has its own version of this, since it's written in Python 3. We don't
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| 6 | # need any support at runtime.
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| 7 | #
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| 8 | # If you need to define a type alias, do something like:
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| 9 | #
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| 10 | # if TYPE_CHECKING:
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| 11 | # NullFunc = Callable[[int, int], int]
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| 12 |
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| 13 | TypingMeta = None
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| 14 | TypeVar = None
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| 15 | _ForwardRef = None
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| 16 | List = None
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| 17 | Sequence = None
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| 18 | Tuple = None
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| 19 | Optional = None
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| 20 | Union = None
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| 21 | IO = None
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| 22 | Dict = None
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| 23 | Iterator = None
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| 24 | Any = None
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| 25 | NoReturn = None
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| 26 | Callable = None
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| 27 | Counter = None # for ID_HIST
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| 28 |
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| 29 | Generic = None # for StackArray[T]
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| 30 |
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| 31 | TYPE_CHECKING = False
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| 32 |
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| 33 |
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| 34 | def cast(typ, val):
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| 35 | """Cast a value to a type.
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| 36 |
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| 37 | This returns the value unchanged. To the type checker this
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| 38 | signals that the return value has the designated type, but at
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| 39 | runtime we intentionally don't check anything (we want this
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| 40 | to be as fast as possible).
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| 41 | """
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| 42 | return val
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