use Config;
use Devel::Peek 'Dump';
use Data::Dumper;
print Dumper(!!defined &Config::non_bincompat_options);
print Dumper(!!*Config::non_bincompat_options{CODE});
print Dumper(Config::non_bincompat_options());

[download]
$VAR1 = '';
$VAR1 = 1;
$VAR1 = 'PERL_COPY_ON_WRITE';
$VAR2 = 'PERL_DISABLE_PMC';
$VAR3 = 'PERL_DONT_CREATE_GVSV';
$VAR4 = 'PERL_HASH_FUNC_ONE_AT_A_TIME_HARD';
$VAR5 = 'PERL_PRESERVE_IVUV';
$VAR6 = 'USE_LOCALE';
$VAR7 = 'USE_LOCALE_CTYPE';
$VAR8 = 'USE_PERL_ATOF';

[download]
The sub clearly exists in a social sense. Why is the sub undefined, yet is a subroutine, which is runnable? Are all subs undefined by their very nature since they aren't scalars? What is going on in the code sample?

In reply to does a subroutine exist? defined vs glob by bulk88

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