To be clear and as many other commenters have stated, VSCode and Rust Analyzer do not require running arbitrary code to view the code with basic syntax highligh

To be clear and as many other commenters have stated, VSCode and Rust Analyzer do not require running arbitrary code to view the code with basic syntax highlighting. When you open a directory for the first time it will pop up a bit blocking dialogue asking if you trust the authors of the contents of that of the directory to allow code execution of it.