mypy 1.0.0 does not include error code for "await" outside function so it cannot be ignored when linting notebooks

[sjdemartini]

Bug Report

In mypy 0.991, mypy would assign error code "misc" when await was used outside a function. Though "misc" is non-specific, having an error code allowed for ignoring these errors when linting Jupyter notebook files (using nbqa mypy file.ipynb with nbqa). Jupyter notebooks already automatically run cells in an async awaited eventloop context (see here), so it's important to be able to ignore these top-level await usages in ipynb files. For instance, Pylance added logic to handle this situation directly here microsoft/pylance-release#1754 (comment).

As of mypy 1.0.0, mypy no longer assigns an error code when await is used outside a function, and treats it as a blocking error that prevents further checking. This means it's now no longer possible to lint notebook files that use await with mypy+nbqa.

I'm guessing this change in behavior was introduced in #14486 here

To Reproduce

Run await in the top level of some file (notebook or otherwise):

async def foo():
    pass

await foo()

Compare:

• mypy 1.0.0: https://mypy-play.net/?mypy=1.0.0&python=3.11&gist=a97bbbf61fb0e0747b4f0a74d4a2124c

  main.py:4: error: "await" outside function
  Found 1 error in 1 file (errors prevented further checking)
  

• mypy 0.991: https://mypy-play.net/?mypy=0.991&python=3.11&gist=a97bbbf61fb0e0747b4f0a74d4a2124c

  main.py:4: error: "await" outside function  [misc]
  Found 1 error in 1 file (checked 1 source file)
  

Expected Behavior

mypy does not halt further checking, and mypy uses an error-code for "await" outside function, so that users can choose to disable the warning when that occurs. That will allow mypy to continue to be used/useful for Jupyter notebook files (for instance, setting --disable-error-code=misc when using nbqa).

Actual Behavior

mypy returns a blocking error and does not provide a workaround.

Your Environment

• Mypy version used: 1.0.1 or 1.0.0
• Mypy command-line flags: --disable-error-code=misc
• Mypy configuration options from mypy.ini (and other config files): any
• Python version used: 3.10+

[hauntsaninja]

cc @JukkaL reasonable use case for this to be a non-blocking error