I learn something new about rust, eg. irrefutable patterns as function argument in the blog. PS: I do not understand what irrefutable patterns means, so I goog

I learn something new about rust, eg. irrefutable patterns as function argument in the blog. PS: I do not understand what irrefutable patterns means, so I google. https://www.haskell.org/tutorial/patterns.html https://www.haskell.org/tutorial/patterns.html in case anyone do not know yet.