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Ignore the generated docs for libextra - #6734
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6734: Emit additional diagnostics for hints/help/etc r=lnicola a=jonas-schievink This makes rust-analyzer diagnostics match native rustc diagnostics in the terminal more closely. Unfortunately all of this is a bodge, since we already provide this information to the client in the form of `DiagnosticRelatedInformation`, but at least VS Code chooses such a poor UI for these that they don't help much, as evidenced [here](https://twitter.com/yaahc_/status/1335297260444250112) and in rust-lang#79741. This PR papers over these client UI problems by taking the `DiagnosticRelatedInformation` and turning each one into its own hint-level diagnostic, which makes it show up in the source code. Quick fixes are attached to all resulting diagnostics, which makes them more discoverable. ### Example: "Consider removing this semicolon"    ### Example: "Value used after move"   Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>
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