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never type

The type of code that never finishes, like panic! or an endless loop.

The never type ! is the type of expressions that never produce a value (panic!, loop without break, process::exit).

Examples

  • In match place { 1 => 10, _ => panic!("no points for place {place}") }, the panic! arm has type !, so it fits where a u32 is expected.

See also

unit type panic return type
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