Macro izip_debug_eq 

macro_rules! izip_debug_eq {
    ( @closure $p:pat => $tup:expr ) => { ... };
    ( @closure $p:pat => ( $($tup:tt)* ) , $_iter:expr $( , $tail:expr )* ) => { ... };
    ($first:expr $(,)*) => { ... };
    ($first:expr, $second:expr $(,)*) => { ... };
    ( $first:expr $( , $rest:expr )* $(,)* ) => { ... };
}

Like itertools::izip!, but uses zip_debug_eq instead of zip.