I can confirm this behaviour on perl 5.18.1 with Scalar::Util 1.35. Looks like a bug to me.
Note that the correct behaviour can be obtained using the experimental “lexical subroutines” feature, introduced in perl 5.18.0 (see perlsub):
use feature 'lexical_subs';
use Scalar::Util 'weaken';
my sub frobnicate
my $local_ref = \&frobnicate;
# $ref = $local_ref;
weaken($ref = $local_ref);
12:49 >perl 775_SoPW.pl
The lexical_subs feature is experimental at 775_SoPW.pl line 10.
Can't use an undefined value as a subroutine reference at 775_SoPW.pl
Hope that helps,
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