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for ( @whatever ) {
    if ( 1 .. 4 ) { 
        # enter this block during the first four iterations, then neve
+r again
    }
}

$_ = 0;
while ($_<6) {
...
4: False
5: False
6: False

$_ = 0
while ($_<6) {
...
4: True
5: True
6: True