Which rustup command is that? I could only find "doc" which opens the documentation in a browser, which is not much help if you've got no internet.
Ah... I see. You have to run "rustup component list" and it'll print out a whole bunch of things that you can install like cargo and rustc and 44 different versions of std and also somewhere in there the docs. And then you have to know that that the thing you have to pass to "rustup component add" is not the string you get out of "rustup component list" (something like "rust-docs-armv7-unknown-linux-gnueabihf") but in fact just "rust-docs". And none of this seems documented anywhere in the help text in rustup itself, at least not the 1.0.0 version that I have.
Ah... I see. You have to run "rustup component list" and it'll print out a whole bunch of things that you can install like cargo and rustc and 44 different versions of std and also somewhere in there the docs. And then you have to know that that the thing you have to pass to "rustup component add" is not the string you get out of "rustup component list" (something like "rust-docs-armv7-unknown-linux-gnueabihf") but in fact just "rust-docs". And none of this seems documented anywhere in the help text in rustup itself, at least not the 1.0.0 version that I have.