Loop indefinitely.

loop is used to define the simplest kind of loop supported in Rust. It runs the code insideit until the code usesbreak or the program exits.

loop{println!("hello world forever!");}letmuti =1;loop{println!("i is {i}");ifi >100{break;    }    i*=2;}assert_eq!(i,128);

Unlike the other kinds of loops in Rust (while,while let, andfor), loops can be used asexpressions that return values viabreak.

letmuti =1;letsomething =loop{    i*=2;ifi >100{breaki;    }};assert_eq!(something,128);

Everybreak in a loop has to have the same type. When it’s not explicitly giving something,break; returns().

For more information onloop and loops in general, see theReference.

See also,for,while.