--alloc The Rust core allocation and collections library
--book The Rust Programming Language book
--cargo The Cargo Book
--core The Rust Core Library
--edition-guide The Rust Edition Guide
--embedded-book The Embedded Rust Book
-h, --help Prints help information
--nomicon The Dark Arts of Advanced and Unsafe Rust Programming
--path Only print the path to the documentation
--proc_macro A support library for macro authors when defining new macros
--reference The Rust Reference
--rust-by-example A collection of runnable examples that illustrate various Rust concepts and standard
libraries
--rustc The compiler for the Rust programming language
--rustdoc Generate documentation for Rust projects
--std Standard library API documentation
--test Support code for rustc's built in unit-test and micro-benchmarking framework
--unstable-book The Unstable Book