Syntax highlighting issue when @ appears as first character after line continuation when indexing is present

[tillahoffmann]

VS Code version

1.62.3

Extension version

v2021.11.1422169775

OS type

macOS

OS version

11.6

Python distribution

Other

Python version

pyenv (installed with brew) in virtual environment (3.8.10)

Language server

Default

Expected behaviour

I would expect syntax highlighting to be the same irrespective of whether the line is broken before or after the @ operator.

Actual behaviour

Steps to reproduce

Enter the following code into a new python file.

# Define variables so pylance doesn't complain.
long_variable_name = other_long_variable_name = 1

long_variable_name \
    @ other_long_variable_name['some_index']

long_variable_name @ \
    other_long_variable_name['some_index']

Logs

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[erictraut]

This is a bug in the TextMate grammar included in the Python extension, not in Pylance. I suspect it's related to the fact that the @ operator is used for decorators, and decorators prior to Python 3.9 could not contain index expressions. In any case, this bug should probably be transferred to the Python extension repo.

[tillahoffmann]

Yes, agreed, @erictraut. Are you able to transfer back to microsoft/vscode-python, @karthiknadig?

[karthiknadig]

TextMate grammar is in the VS Code repo not in the python extension. We should move this there.

[tillahoffmann]

Aha, my bad. Thanks for clarifying.

[alexr00]

Copied to the upstream repo that we pull the python grammar from: MagicStack/MagicPython#253