disclaimer: I'm a Rust dev. * ability to reference other files in a manner other than copy/pasting - allowing the compiler to understand when it should cache

disclaimer: I'm a Rust dev. * ability to reference other files in a manner other than copy/pasting - allowing the compiler to understand when it should cache what it already knows, instead of having to set up and deal with precompiled headers for large projects - ability to treat a header file as a single unit and not leak preprocessor defines * treating many files as a single compilation unit, leaving LTO to only be needed when linking to a library