Compiling let a = '\e'
gives an error with a link to The Rust Reference for more information.
I have never seen that document linked anywhere else and was surprised to find that instead of Tokens - The Rust Reference.
Is the former a deprecated version of the Rust Reference book? If so, I'd be happy to open a PR which replaces the link with a link to Rust Reference Book.
rustc version: rustc 1.71.0 (8ede3aae2 2023-07-12)