# std::panic!1.0.0 [−] [src]

    macro_rules! panic {
        () => { ... };
        ($msg:expr) => { ... };
        ($fmt:expr, $($arg:tt)+) => { ... };
    }

1.0.0

The entry point for panic of Rust threads.

This macro is used to inject panic into a Rust thread, causing the thread to panic entirely. Each thread's panic can be reaped as the `Box<Any>` type, and the single-argument form of the `panic!` macro will be the value which is transmitted.

The multi-argument form of this macro panics with a string and has the `format!` syntax for building a string.

# Examples

fn main() { #![allow(unreachable_code)] panic!(); panic!("this is a terrible mistake!"); panic!(4); // panic with the value of 4 to be collected elsewhere panic!("this is a {} {message}", "fancy", message = "message"); }

    panic!();
    panic!("this is a terrible mistake!");
    panic!(4); // panic with the value of 4 to be collected elsewhere
    panic!("this is a {} {message}", "fancy", message = "message");

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