Function json_decode::map

pub fn map<'a, F, T1, NewDecodesTo>(
    func: F, 
    d1: BoxDecoder<'a, T1>
) -> BoxDecoder<'a, NewDecodesTo> where
    F: Fn(T1) -> NewDecodesTo + 'a + Send + Sync,
    NewDecodesTo: 'a,
    T1: 'a,