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#[macro_export]
macro_rules! stream_zip {
( @closure $p:pat => $tup:expr ) => {
|$p| $tup
};
( @closure $p:pat => ( $($tup:tt)* ) , $_iter:expr $( , $tail:expr )* ) => {
stream_zip!(@closure ($p, b) => ( $($tup)*, b ) $( , $tail )*)
};
($first:expr $(,)*) => {
$first
};
($first:expr, $second:expr $(,)*) => {
stream_zip!($first)
.zip($second)
};
( $first:expr $( , $rest:expr )* $(,)* ) => {
stream_zip!($first)
$(
.zip($rest)
)*
.map(
stream_zip!(@closure a => (a) $( , $rest )*)
)
};
}