1.0.0[−][src]Macro std::panic
Panics the current thread.
This allows a program to terminate immediately and provide feedback
to the caller of the program. panic!
should be used when a program reaches
an unrecoverable state.
This macro is the perfect way to assert conditions in example code and in
tests. panic!
is closely tied with the unwrap
method of both Option
and Result
enums. Both implementations call panic!
when they are set
to None or Err variants.
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.
Result
enum is often a better solution for recovering from errors than
using the panic!
macro. This macro should be used to avoid proceeding using
incorrect values, such as from external sources. Detailed information about
error handling is found in the book.
The multi-argument form of this macro panics with a string and has the
format!
syntax for building a string.
See also the macro compile_error!
, for raising errors during compilation.
Current implementation
If the main thread panics it will terminate all your threads and end your
program with code 101
.
Examples
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");Run