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Postings from September 2012
On Tue Jun 07 21:41:45 2011, dmcbride wrote:
>
> This is a bug report for perl from dmcbride@naboo.to.org,
> generated with the help of perlbug 1.39 running under perl 5.12.3.
>
>
> -----------------------------------------------------------------
> [Please describe your issue here]
>
> This is pretty much the reverse of 7589 and is largely summed up
> by Nick Ing-Simmons in
> http://rt.perl.org/rt3/Ticket/Display.html?id=7589#txn-18370
>
> Because the backtrace does not show anything about the object, it
> is of limited use. Some feature addition that allowed the user
> and/or object to detail how to describe references in a backtrace
> would make debugging with Carp far easier. For example, allowing
> objects to have a CARP_TRACE method which would do the "obvious"
> thing that stringify would do, but is not permitted to recurse back
> into Carp. Or even having Carp detect this recursion with a localised
> global variable, and only resorting to overload::StrVal if the
> recursion
> is attempted/detected.
>
> Similarly, from the user perspective, especially for non-object
> references, a way to override the stringification of HASHes, ARRAYs,
> and SCALARs (and maybe objects as well). By inserting some function
> somewhere, I could dump the hash in question via JSON::XS, and see
> the entire hash in the output. Given the PBP suggestion to pass in
> parameters via a hash reference, this would allow developers to use
> the PBP suggestion and still gain value from Carp::cluck and
> Carp::confess.
>
> e.g.:
>
> package Foo;
>
> use overload
> q[""] => 'as_string';
>
> sub new {
> shift;
> return bless {@_}
> }
>
> sub as_string
> {
> my $self = shift;
> join '=', ref $self, $self->{key} || "<no key>";
> }
>
> package main;
>
> use Carp;
>
> my $f = Foo->new(key => 'Baz');
> print "overload: $f\n";
> with_longmess($f, {bar=>'buzz'});
>
> sub with_longmess
> {
> my $g = shift;
> Carp::cluck "longmess:";
> }
>
> Output:
>
> overload: Foo=Baz
> longmess: at longmess.pl line 28
> main::with_longmess('Foo=HASH(0xacad48)', 'HASH(0xb1cc90)')
> called at longmess.pl line 23
>
> Unfortunately, this tells me very little about what the parameters
> were.
>
Reproduced with Perl 5.16.0, Carp version 1.26.
---
via perlbug: queue: perl5 status: new
https://rt.perl.org:443/rt3/Ticket/Display.html?id=92446
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