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I think this gives some context?: https://fasterthanli.me/articles/my-gift-to-the-rust-docs-te... TLDR: for rust doc highlighting stuff in document

This is very cool, also I wonder does fugc works without InvisiCap, what would it be like without the capability pointer, does it just became not accurate but still usable?

Just a guess, maybe they have more complex functions that shadow can't cover, or want to test with "more granularly in the mainline code"?