fn main() { let (oh, woe, is, me) = ("the", "Turbofish", "remains", "undefeated"); let _: (bool, bool) = (oh<woe, is>(me)); } So we have four strings

fn main() { let (oh, woe, is, me) = ("the", "Turbofish", "remains", "undefeated"); let _: (bool, bool) = (oh<woe, is>(me)); } So we have four strings, one named "oh", one named "woe", one named "is" and one named "me". (varA, varB) is a tuple in Rust that contains two variables, named varA and varB. oh < woe Is checking to see if "oh" is less than "woe" is > (me) is checking to see if "is" is greater than "me" (ignore the extra parentheses. So: (oh<woe, is>(me)) with some more spacing to make it easier to see, and with the extra parentheses removed is: (oh < woe, is > me) Basically it creates a tuple with the result of the above comparisons.