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Port & upstream mypyc wheel build workflow (#3197)
[etc/vim.git] / src / black / rusty.py
1 """An error-handling model influenced by that used by the Rust programming language
2
3 See https://doc.rust-lang.org/book/ch09-00-error-handling.html.
4 """
5 from typing import Generic, TypeVar, Union
6
7 T = TypeVar("T")
8 E = TypeVar("E", bound=Exception)
9
10
11 class Ok(Generic[T]):
12     def __init__(self, value: T) -> None:
13         self._value = value
14
15     def ok(self) -> T:
16         return self._value
17
18
19 class Err(Generic[E]):
20     def __init__(self, e: E) -> None:
21         self._e = e
22
23     def err(self) -> E:
24         return self._e
25
26
27 Result = Union[Ok[T], Err[E]]