Function core_extensions::measure_time::try_measure

pub fn try_measure<F, T, E>(f: F) -> Result<(MyDuration, T), E> where
    F: FnOnce() -> Result<T, E>, 

Measures the time taken by fallible function f to execute, returning a pair of Result<(MyDuration,T),E>, so that this function can be used in combination with ?.