Lint idea: `missing_panic_message`

What it does

Check if panic!, todo!, unimplemented!, unreachable! have a custom panic message configured (similar to missing_assert_message)

Advantage

• Code documentation

• Panic investigation

  Could help locating the panic by using its message on top of the bracktrace.

  For a software I develop, we use sentry to report error on our rust code (mostly panic)
  During one of the panic caused by a todo!, we where not sure from where it was coming from because the backtrace provided by sentry did not contain the line number.

  The message would have helped to know precisely which todo! the panic was coming from.

Drawbacks

No response

Example

fn panic_is_not_5(v: u32) {
  if v != 5 {
    panic!()
  }
}

Could be written as:

fn panic_is_not_5(v: u32) {
  if v != 5 {
    panic!("Called with the value {v} that is not 5")
  }
}