dotfiles/private_dot_emacs.d/modules/rust.el

(defvar wi-rust--prettify-symbols-alist
  `(("fn" . ,(string-to-symbols "λ"))
    ("struct" . ,(string-to-symbols "define-structure"))
    ("enum" . ,(string-to-symbols "define-enumeration"))
    ("const" . ,(string-to-symbols "define-constant"))
    ("static" . ,(string-to-symbols "define-mutable-constant"))
    ("impl" . ,(string-to-symbols "implement"))
    ("u8" . ,(string-to-symbols "ℕ₈"))
    ("u16" . ,(string-to-symbols "ℕ₁₆"))
    ("u32" . ,(string-to-symbols "ℕ₃₂"))
    ("u128" . ,(string-to-symbols "ℕ₁₂₈"))
    ("usize" . ,(string-to-symbols "pointer-size"))
    ("i8" . ,(string-to-symbols "ℤ₈"))
    ("i16" . ,(string-to-symbols "ℤ₁₆"))
    ("i32" . ,(string-to-symbols "ℤ₃₂"))
    ("i128" . ,(string-to-symbols "ℤ₁₂₈"))
    ("isize" . ,(string-to-symbols "pointer-size"))
    ("bool" . ,(string-to-symbols "boolean"))
    ("derive" . ,(string-to-symbols "automatically-create-implementation"))
    ;; ("allow" . ,(string-to-symbols "reuse-as-fields-of-another-struct"))
    ("mut" . ,(string-to-symbols "mutable-bind"))
    ("type" . ,(string-to-symbols "alias"))
    ("->" . ,(string-to-symbols "→"))

    ;; https://stackoverflow.com/a/47641166
    ("&'a" . ,(string-to-symbols "the-lifetime-a"))
    ("'_" ,(string-to-symbols "anonymous-lifetime"))

    ("use" . ,(string-to-symbols "bind-full-path-to-name"))
    ("as" . ,(string-to-symbols "bind-import-to-a-different-name"))
    ("attribute" . ,(string-to-symbols "metadata-applied-to-module"))
    ("trait" . ,(string-to-symbols "collection-of-methods-defined-for-an-unknown-type-self"))))

(add-hook 'rust-mode-hook
          (lambda ()
            (set (make-local-variable 'prettify-symbols-alist)
                 wi-rust--prettify-symbols-alist)
            (rainbow-delimiters-mode 0)))