#![feature(if_let_guard)] #![deny(irrefutable_let_patterns)] fn main() { if let _ = 5 {} //~ ERROR irrefutable `if let` pattern while let _ = 5 { //~ ERROR irrefutable `while let` pattern break; } match 5 { _ if let _ = 2 => {} //~ ERROR irrefutable `if let` guard pattern _ => {} } }