Function test_panic 

pub fn test_panic<F, R>(f: F) -> TestPanicResult<R>
where
    F: FnOnce() -> R,

Execute the closure and get its return value or panic information.

In context of this function, even if a closure panics, writing to the standard error output about that panic will not be performed. This is because it is not useful to see information about errors as planned for testing.

Notes

Test only

This function is intended only for use in test automation and is not suitable for other situations.

After panic

If f panics, the logical invariance condition can be broken unless the operations in f take post-panic operations into account. Therefore, access to each state after panic should be done with great care.