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.
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.