Closed
Description
Bug Report
When I transform a value into an enum, an error occurs in the match case construct. If you convert the value in advance, there will be no error. Same issue #14109 #14264 .
To Reproduce
import typing
import enum
class Color(enum.StrEnum):
RED = enum.auto()
GREEN = enum.auto()
BLUE = enum.auto()
def test(color: str) -> str:
match Color(color):
case Color.RED:
return 'red'
case Color.GREEN:
return 'green'
case Color.BLUE:
return 'blue'
case _ as unreachable:
typing.assert_never(unreachable)https://mypy-play.net/?mypy=latest&python=3.11&gist=d28ae2af9f4545ca1c302476d8e4c782
import typing
import enum
class Color(enum.StrEnum):
RED = enum.auto()
GREEN = enum.auto()
BLUE = enum.auto()
def test(color: str) -> str:
color = Color(color)
match color:
case Color.RED:
return 'red'
case Color.GREEN:
return 'green'
case Color.BLUE:
return 'blue'
case _ as unreachable:
typing.assert_never(unreachable)https://mypy-play.net/?mypy=latest&python=3.11&gist=eab4deab65eb38a49649a46a2adc1e42
Actual Behavior
In the first example:
main.py:18: error: Argument 1 to "assert_never" has incompatible type "Color"; expected "NoReturn" [arg-type]
Found 1 error in 1 file (checked 1 source file)
In the second example:
Success: no issues found in 1 source file
Your Environment
- Mypy version used: mypy 0.991 (compiled: yes)
- Mypy command-line flags: N/A
- Mypy configuration options from
mypy.ini(and other config files): N/A - Python version used: 3.11.1