Rewriting the GNU Coreutils in Rust

ripgrep (much like all the other enhanced searcher programs out there such as Ack or Silver Surfer) isn't supposed to be a drop-in replacement for grep. It's supposed to do something similar, but in a better way and way faster. Yeah, ideally it would replace grep, but not as a drop-in but as a better alternative.

This is a different goal than rewriting programs or collections such as Coreutils.