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use strict;
use warnings;
...
for $i (0..10) {
    print $i;
}

Global symbol "$i" requires explicit package name at /tmp/tst2.pl line
+ 6.
Global symbol "$i" requires explicit package name at /tmp/tst2.pl line
+ 7.
...
Global symbol "$i" requires explicit package name at /tmp/tst2.pl line
+ 7.
Execution of /tmp/tst2.pl aborted due to compilation errors.
 at /tmp/tst2.pl line 10