368e0bb32f
Colorize `cargo check` diagnostics in VSCode via text decorations Fixes #13648  Use ANSI control characters to display text decorations matching the VScode terminal theme, and strip them out when providing text content for rustc diagnostics. This adds the small [`anser`](https://www.npmjs.com/package/anser) library (MIT license, no dependencies) to parse the control codes, and it also supports HTML output so it should be fairly easy to switch to a rendered HTML/webview implementation in the future I also updated the default `cargo check` command to use the rendered ANSI diagnostics, although I'm not sure if it makes sense to put this kind of thing behind a feature flag, or whether it might have any issues on Windows (as I believe ANSI codes are not used for colorization there)?
rust-analyzer is a modular compiler frontend for the Rust language. It is a part of a larger rls-2.0 effort to create excellent IDE support for Rust.
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