How did you get it to work? Some sources seem to imply it's a default feature in vscode but there are reports that the rust-analyzer extension has broken it?
Found this post by web searching, so not a timely reply.
Personally, I use #region folding for VS Code - Visual Studio Marketplace for #region code collapse. Default style is /* #region [NAME] */ and /* #endregion */.
Please note that some vscode settings (such as editor.foldingStrategy) may clash with vscode extensions.
I'd love to see something that could fold all doc comments with a toggle. I'd learn the heck out of that keyboard shortcut!
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