rust-doc.vim
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Support `rustup doc`
rustup now supported doc subcommand at v1.20.
https://blog.rust-lang.org/2019/10/15/Rustup-1.20.0.html
The rustup doc command opens the locally installed documentation on your browser, without any Internet connection required. rustup 1.20.0 enhances the command allowing you to open directly the API documentation of a specific item.
This would make this plugin simpler and stable rather than managing document by itself.