ror with that message,
reports it, and propagates it for you.

`Result` on the other hand is used to wrap other types that represent either
the successful result of some computation, `Ok(T)`, or error types that
represent an anticipated runtime failure mode of that computation, `Err(E)`.
`Result` is used alongside user defined types which represent the various
anticipated runtime failure modes that the associated computation could
encounter. `Result` must be propagated manually, often with the help of the
`?` operator and `Try` trait, and they must be reported manually, often with
the help of the `Error` trait.

For more detailed information about error handling check out the [book] or the
[`std::result`] module docs.

[ounwrap]: Option::unwrap
[runwrap]: Result::unwrap
[`std::panic::set_hook()`]: ../std/panic/fn.set_hook.html
[`panic_any`]: ../std/panic/fn.panic_any.html
[`Box`]: ../std/boxed/struct.Box.html
[`Any`]: crate::any::Any
[formatting syntax]: ../std/fmt/index.html
[book]: ../book/ch09-00-error-handling.html
[`std::result`]: ../std/result/index.html

# Current implementation

If the main thread panics it will terminate all your threads and end your
program with code `101`.

# Editions

Behavior of the panic macros changed over editions.

## 2021 and later

In Rust 2021 and later, `panic!` always requires a format string and
the applicable format arguments, and is the same in `core` and `std`.
Use [`std::panic::panic_any(x)`](../std/panic/fn.panic_any.html) to
panic with an arbitrary payload.

## 2018 and 2015

In Rust Editions prior to 2021, `std::panic!(x)` with a single
argument directly uses that argument as a payload.
This is true even if the argument is a string literal.
For example, `panic!("problem: {reason}")` panics with a
payload of literally `"problem: {reason}"` (a `&'static str`).

`core::panic!(x)` with a single argument requires that `x` be `&str`,
but otherwise behaves like `std::panic!`. In particular, the string
need not be a literal, and is not interpreted as a format string.

# Examples

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