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Current File : //lib/python3/dist-packages/black/rusty.py

"""An error-handling model influenced by that used by the Rust programming language

See https://doc.rust-lang.org/book/ch09-00-error-handling.html.
"""
from typing import Generic, TypeVar, Union


T = TypeVar("T")
E = TypeVar("E", bound=Exception)


class Ok(Generic[T]):
    def __init__(self, value: T) -> None:
        self._value = value

    def ok(self) -> T:
        return self._value


class Err(Generic[E]):
    def __init__(self, e: E) -> None:
        self._e = e

    def err(self) -> E:
        return self._e


Result = Union[Ok[T], Err[E]]

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