Question 134533 in Visual Studio Code Question posted in
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Visual Studio Code – How to get the syntax highlighter (Rust) to highlight formatted strings correctly in VSCode?

For example, here I am expecting sum and FILENAME to be in different colors than the rest of the string literal:

example screenshot

I am using VSCode with rust-analyzer v0.4.1395 (Pre-release).

Seems like Markdown also has this problem:

println!("this is a formatted string with a {variable}, and an expression: {3+5}");

edit:

  1. An example for my expectation can be seen in @Finomnis ‘s answer.
  2. As noted by people in the comments, expressions such as {3+5} are not supported in formatted strings in Rust.
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3

Answers


  1. 0

    This requires semantic information, because not every string literal is a format string, and thus cannot be done by syntactic highlighting.

    rust-analyzer handles this though, with semantic highlighting.

    Besides, full expressions like 3+5 are not supported in format strings.

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  2. 0

    I’m running VSCode 1.74.2 and rust-analyzer v0.3.1394, and it works without a problem:

    enter image description here

    With rust-analyzer 0.4.1395 (PreRelease), it looks the same to me.

    Note that while rust-analyzer is still loading (spinning circle in the bottom bar), or if rust-analyzer encountered an error (displayed red in the bottom), only the VSCode internal Rust highlighting is enabled, which can not highlight strings syntactically:

    enter image description here

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  3. 0

    It seems like it’s theme dependent:
    Dark+ (default dark):
    default dark+ theme

    Noctis Obscuro:
    enter image description here

    Edit: it’s a theme setting: vscode editor-semantic-highlighting
    settings.json:

    "editor.semanticTokenColorCustomizations": {
    "[Noctis*]": {
        "enabled": true
    }
}
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