I also love this.
Offline API docs are wonderful. I tried to use `rustup doc --book` on the train with poor WiFi recently though and it tried to load some Google fonts I didn't have cached, so my initial experience with the offline book was quite slow. 
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It's already fantastic! Tweaks like making it fully offline would just be icing on the cake.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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