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    my( $a, $b ) = ( shift @as, shift @bs );
    
  2. or download this
    while( ($x) = shift @a ) {    # Broken
    while(  $x  = shift @a ) {    # Fixed
    ...
    
    my( $a, $b ) = ( shift @as, shift @bs );
    my( $a, $b ) = ( scalar shift @as, scalar shift @bs );