..and since you're freeing up ~, you can now rename 'fn' to it. Rust criticism would drop to nearly zero, because everyone would focus in on your crazy function-defining-tilde and those people just don't get it.
fn is my favorite keyword for function definition. "function" is too long. "def" doesn't say anything about functions (unless you read it as DEfine Function). "func" sounds too funny. "defun" always reads "defunct" to me.
And just out of curiosity, where did the rust designers get the inspiration for "fn"? I know plan 9 rc and clojure have "fn". Or maybe it's independent invention?
