in reply to Re: does a subroutine exist? defined vs glob
in thread does a subroutine exist? defined vs glob

Yes. To amplify the point about autoloading, try this:
use Config;
print "defined before\n" if defined &Config::non_bincompat_options;
Config::non_bincompat_options();
print "defined after\n" if defined &Config::non_bincompat_options;

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Calling the sub causes it to become defined through autoloading.

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Re^3: does a subroutine exist? defined vs glob
by Anonymous Monk on Jul 23, 2015 at 16:54 UTC
    ... and there's a bit of magic that I hadn't realized before, because you can do the same thing with a coderef.
    use Config;
my $sub = *Config::non_bincompat_options{CODE};
print "defined before\n" if defined &$sub;
$sub->();
print "defined after\n" if defined &$sub;

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    Same result: not defined before, but defined after.
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[d/l]

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