use {{ ... effectively turning the line in the next debugger step into a comment.
I don't think this has the desired effect of commenting out the
lines. Rather, it runs the debugger command "#" (which does nothing of
interest) before running the line itself. Even if you'd use pre-Perl
actions (i.e. <), they would still be executed separately, rather than
being textually merged with the line(s) in question (as would be required to comment out).
Try skipping over the $i++, for example... the subsequent print " $i\n" will
still print the incremented value (e.g. 3, not 2, on the first iteration).
An example application of pre-debugger commands would be setting "{ l" to
get a listing of the next few lines on every prompt.
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