It's not going to happen. By the time the debugger gets your script, it's already compiled. If you're in a function, there's no way for it to change that function and continue in the changed version. The only thing I can think of that might work is to write a source filter to add labels before every line, then run the debugger on that version of the script, e.g. turn this:
my $x = 23;
die "blaagh!";
into this:
LINE1: my $x = 23;
LINE2: die "blaagh!"
then execute a goto in the debugger. Perl's goto is insanely powerful. Unfortunately, you would more or less have to parse the script to do this without introducing syntax errors (think multiline statements), so you're probably hosed.
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