Function assert_loopback 

pub fn assert_loopback<T>(value: &T)
where
    T::Err: Debug,
    T: Debug + FromStr + ToString + PartialEq,

Asserts that a value that implements both FromStr and ToString may be marshalled to a string and back again to an equivalent (by a PartialEq comparison) value.

Panics

If the assertion fails.