1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 // trailing return type fn square ( x : u32 ) -> u32 { // return on last line can be omitted x * x } // mutable reference fn increment ( x : & mut u32 ) { * x += 1 ; } fn main (){ // Introduce variables with let. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 trait MyTrait { fn my_fn ( & self ); } impl MyTrait for usize { fn my_fn ( & self ) { eprintln! Iterators Link to heading