One thing I've found useful in debugging is to use levels, e.g.:
my $debug = 11;
...
print STDERR "something worked: $wombat\n" if $debug > 5;
...
print STDERR "in here: too much detail", join ", ", @_, "\n"
if $debug > 20;
etc. That way I can leave them in until production or later,
and bump things back up when I break something. I try to make
it a habit to always write debug noise in like that at the
start (every "print STDERR ..." line has a debug level) and it
works out much easier as the development progresses.
You could add something like that:
debugprint("now entering mysub ...\n", 11);
sub debugprint($$)
{
my ($err_str, $debug_value) = @_;
print $err_str if $debug_value >= $debug;
or something ...
a
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