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print "$_ and $i\n" for ($i = 1, $i++, $i++);

...
3 and 3
1 and 3
2 and 3

print "$_ and $i\n" for (\($i = 1, $i++, $i++));
print \$i , "\n";
...
SCALAR(0x815dcc0) and 3
SCALAR(0x815dad4) and 3
SCALAR(0x8176c44)