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push @missing_ids, $idslist[ $_ ] +1 .. $idslist[ $_+1 ] -1 for 0 .. $
+#idslist-1;

for ( 0 .. $#idslist-1 ) {
    push @missing_ids, $idslist[ $_ ] +1 .. $idslist[ $_+1 ] -1;
}