feat: add support for dataclasses._MISSING_TYPE

[majiayu000]

Motivation

I am using fairseq with Python 3.11, finding that there are some compatibility issues here. If I want to use newer version, I have to change some code.

The error code as above

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

I made a test file to reproduce this error.

Fixes

Fixes #1136

Related PRs

Not found