Beta version of rustdoc-settings-sync addon with support for rewriting standard library links to point at your local copy: https://gitlab.com/notriddle/rustdoc-settings-sync/-/tags/v0.5.0
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p.s. the reason why the rewriting only happens on file: urls is because of this: https://textslashplain.com/2019/10/09/navigating-to-file-urls/ — if there's demand, then I can probably work around it.
