Weird syntax highlighting in interpolated strings

[zbiggs1]

Describe the bug

The syntax highlighting with variables in interpolated strings seems to be messed up. I tried changing themes to see if that was the issue but it had no effect. Not sure if this is just how the design is or if it is a bug.

Steps to reproduce

See screenshots for example.

Expected behaviour

Screenshot of Jetbrains Rider interpolated string highlighting

Screenshots

Screenshot of VS code with Ionide for F# extension and Rider Dark Theme

VS code and dark modern theme

Machine info

• OS: Windows 11 Pro Version 23H2 (OS Build 22631.4037)
• .NET SDK version: 8.0.401
• Ionide version: v7.21.0

[baronfel]

Can you invoke the "Inspect tokens and scopes" command from the palette and hover over the areas that aren't colorized (so {name}, \n, .Result, etc and see what tokens and scopes VSCode reports here? Ionide broadly just uses the scopes reported by the compiler, so if those areas aren't getting tagged correctly that could be a compiler bug.

[zbiggs1]

[zbiggs1]

I realized that with the dark modern the variables and \n are correct it's just the parentheses on methods and the .Result after those parentheses. I think that the others like the \n and variable names are a theme issue.

[github-actions]

🤖 This is an automated response from Repo Assist.

Thanks for sharing the token scope screenshots — that's exactly the right diagnostic tool to use here!

Based on what you've shared, the issue (method-call parentheses and .Result member access inside interpolated strings not being coloured) is in the TextMate grammar tokenizer, not the language server. Semantic highlighting from the language server sits on top of the grammar, but the basic colorization of expression syntax inside interpolations comes from the grammar rules first.

Ionide's syntax highlighting grammar lives in a separate repository:
👉 ionide/ionide-fsgrammar

Would you be able to file an issue there with your screenshots? The grammar maintainers will have the best context for fixing how method-call syntax inside $"..." interpolation holes is tokenized. A similar interpolated-string grammar issue (#1876) was also redirected there.

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