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The book was located under 'src/doc/trpl' because originally, it was going to be hosted under that URL. Late in the game, before 1.0, we decided that /book was a better one, so we changed the output, but not the input. This causes confusion for no good reason. So we'll change the source directory to look like the output directory, like for every other thing in src/doc.
Rust documentations
Building
To generate all the docs, follow the "Building Documentation" instructions in the README in the root of the repository. This will convert the distributed Markdown docs to HTML and generate HTML doc for the books, 'std' and 'extra' libraries.
To generate HTML documentation from one source file/crate, do something like:
rustdoc --output html-doc/ --output-format html ../src/libstd/path.rs
(This, of course, requires a working build of the rustdoc tool.)
Additional notes
To generate an HTML version of a doc from Markdown manually, you can do something like:
rustdoc reference.md
(reference.md being the Rust Reference Manual.)
An overview of how to use the rustdoc command is available in the docs.
Further details are available from the command line by with rustdoc --help.