The constant form of the flip-flop only operates against $.. Ie. The line number of the current file being read. Hence the first loop below produces the output expected, but the second does not.
#! perl -slw
use strict;
while( <DATA> ) {
print if 1..4;
}
for ( 1 .. 8 ) {
print if 1..4;
}
__DATA__
line 1
line 2
line 3
line 4
line 5
line 6
line 7
line 8
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