[BUG] VS Code Extension - Weird Syntax Highlighting with raises Keyword

[johnsoez4]

Bug description

The color weirdness shown in the first screenshot appears in the Mojo code after a function uses the raises keyword. In this example fn main() raises: appears at the beginning of a file. The colors look OK if raises is removed.
Asked to create a bug report by @ehsanmok (Ehsan Kermani).
Discord: https://discord.com/channels/1087530497313357884/1224434323193594059/1324229203163615273

Steps to reproduce

fn main() raises:
# fn main():  # OK
    pass


# Mojo modules
from python import Python
from math import ceil
from testing import assert_true
from time import sleep

Uses the raises keyword - KO

Removed the raises keyword - OK

System information

magic 0.5.1 - (based on pixi 0.37.0)
Mojo 🔥 (nightly): 2024.12.2805
Ubuntu: 24.10

VS Code:
Version: 1.96.0
Commit: 138f619c86f1199955d53b4166bef66ef252935c
Date: 2024-12-11T02:29:09.626Z
Electron: 32.2.6
ElectronBuildId: 10629634
Chromium: 128.0.6613.186
Node.js: 20.18.1
V8: 12.8.374.38-electron.0
OS: Linux x64 6.11.0-13-generic snap

[gphlipot]

Do you have the vscode setting editor.semanticHighlighting.enabled set to true? I only see the weird highlighting when I have it set to true. If I set it to false or "configuredByTheme", then I get normal syntax highlighting. I also see this same behavior in both the nightly and the released versions.

When it is set to true, I think this causes the LSP to be used for syntax highlighting instead of the textmate grammar. And it seems like the syntax highlighting from the LSP is weird.

[johnsoez4]

The VS Code setting is Enabled as selected in the dropdown configuredByTheme (default) versus an explicit True or False.

[johnsoez4]

This issue with the VS Code extension started with version 2024.12.2305. See below for the versions I checked today. I also reconfirmed that the immediately prior version (2105) was still OK.

Mojo 🔥 (nightly):

• 2024.11.3005 - OK
• 2024.12.1405 - OK
• 2024.12.2105 - OK
• 2024.12.2305 - KO <--
• 2024.12.2405 - KO
• 2024.12.2805 - KO

[johnsoez4]

Per GitHub, commit 2024.12.2305 updated five (5) magic.lock files to point to latest nightly version: 25.1.0.dev2024122305.
Raw Mojo diff: f4b34fc...22aa305