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This queue is for tickets about the Method-Signatures CPAN distribution.

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The Basics
Id: 60087
Status: resolved
Priority: 0/
Queue: Method-Signatures

People
Owner: Nobody in particular
Requestors: mschwern [...] cpan.org
Cc:
AdminCc:

Bug Information
Severity: Normal
Broken in: 20100730
Fixed in: (no value)



Subject: Compile warning in the debugger
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When a module that uses Method::Signatures is loaded in the debugger, AND it turns warnings on, there will be a "Useless use of a constant" warning. package Foo; use warnings; use Method::Signatures; method foo() { } 1; $ perl -I ~/tmp -dwle 'use Foo' Loading DB routines from perl5db.pl version 1.33 Editor support available. Enter h or `h h' for help, or `man perldebug' for more help. Useless use of a constant (undef) in void context at /Users/schwern/tmp/Foo.pm line 8. at /Users/schwern/tmp/Foo.pm line 8 require Foo.pm called at -e line 1 main::BEGIN() called at /Users/schwern/tmp/Foo.pm line 10 eval {...} called at /Users/schwern/tmp/Foo.pm line 10 main::(-e:1): 1 DB<1> This may be because of a difference between the nextstate and dbstate ops. It is definitely a consequence of using Devel::BeginLift. `perl -MO=Concise -d Foo.pm` tells the story: 4 <@> leave[1 ref] vKP/REFC ->(end) 1 <0> enter ->2 2 <;> dbstate(Foo 1751 Foo.pm:8) v:*,&,{,$ ->3 - <0> null v ->3 3 <;> dbstate(Foo 1751 Foo.pm:10) v:*,&,{,$ ->4 - <0> ex-const v ->4 I believe Perl is warning about that null op created by BeginLift tearing the code call out.
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Method::Signatures no longer uses Devel::BeginLift as of 20121108.0047_001. This bug no longer applies.


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