Avoid erasing type objects when checking runtime cover #19320
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In particular, avoid erasing CallableType that represent type objects Helps with python#19159
hauntsaninja
changed the title
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Diff from mypy_primer, showing the effect of this PR on open source code: starlette (https://github.com/encode/starlette)
+ starlette/middleware/errors.py:178: error: Argument 1 to "run_in_threadpool" has incompatible type "Callable[[Request, Exception], Response | Awaitable[Response]] | Callable[[WebSocket, Exception], Awaitable[None]]"; expected "Callable[[Request, Exception], Response]" [arg-type]
+ starlette/_exception_handler.py:61: error: Argument 1 to "run_in_threadpool" has incompatible type "Callable[[Request, Exception], Response | Awaitable[Response]] | Callable[[WebSocket, Exception], Awaitable[None]]"; expected "Callable[[Request | WebSocket, Exception], Any]" [arg-type]
+ starlette/routing.py:68: error: Incompatible types in assignment (expression has type "Callable[..., Awaitable[Any]] | partial[Coroutine[Any, Any, Awaitable[Response] | Response]]", variable has type "Callable[[Request], Awaitable[Response]]") [assignment]
+ starlette/routing.py:68: error: Too few arguments for "run_in_threadpool" [call-arg]
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In particular, avoid erasing CallableType that represent type objects
Helps with #19159