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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