Pylance function return type inlay hints do not work on closures

[randori-ddejohn]

Environment data

• Pylance version: v2024.7.1
• OS and version: Windows 11
• Python version (& distribution if applicable, e.g. Anaconda): clean install of Python 3.11

Code Snippet

def simple_closure(a: int):
    def doubler():
        return a * 2
    return doubler

Repro Steps

1. configure Pylance extension in settings.json with "python.analysis.inlayHints.functionReturnTypes": true,
2. open a new file
3. paste the code
4. double click the inlay type hint

Expected behavior

The type hint should import Callable and fill in the type hint

Actual behavior

As you can see, double clicking to insert the type hint adds it as a comment. Repeatedly double-clicking keeps appending a new comment onto the end of the line.

default.C__Users_8J3434897_Desktop_test.py.2025-01-02.11-58-41.mp4

Logs

No logs to show.