Function cron::whitespace::sp

pub fn sp<'a, T>(input: T) -> Result<(T, T), Err<T, u32>> where
    T: InputTakeAtPosition,
    <T as InputTakeAtPosition>::Item: AsChar,
    <T as InputTakeAtPosition>::Item: Clone,
    &'a str: FindToken<<T as InputTakeAtPosition>::Item>,