Weak references are not implemented ...

Normally, that problem is related to a version of Scalar::Util that hasn't been built with XS support. Scalar::Util can in principle be built as a pure Perl module with restricted functionality (e.g. no weaken routine), or as the fully functioning XS version.  Storable's weak.t test loads Scalar::Util, which is where you're getting the error, because Scalar::Util realizes it doesn't have XS support and thus can't honor the import requests:

  ...
  require Scalar::Util;
  Scalar::Util->import(qw(weaken isweak));   # line 28 in weak.t
  if (grep { /weaken/ } @Scalar::Util::EXPORT_FAIL) {
    print("1..0 # Skip: No support for weaken in Scalar::Util\n");
    exit 0;
  }
[download]

Now, the real question is, why do you have a non-XS Scalar::Util?  A couple of possible reasons:

• Your version of Perl is too old (< v5.6) and truly doesn't support weak references  (unlikely)
• Due to a configure error, Scalar::Util has been built as the pure Perl version
• A wrong version of Scalar::Util is being loaded (e.g. from a different installation of Perl), for example because you have PERL5LIB pointing to directories which don't belong to the version of Perl you're currently dealing with.
• Scalar::Util's associated (existing) .so file isn't being loaded for whatever reason.
• ...

So... What version(s) of Perl do you have on that machine? Which version are you trying to build with debug support? What were the configure options you used (post output of perl -V)? Any unusual messages/errors during configuring/building? Which platform are you on?

PS. see also Weak references are not implemented and Test::Deep - weak references are not implemented

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