perl 5.16.3 + Tk 804.031 core dumps on syntax check when a window is made in BEGIN block

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Syntax check of the program (perl 5.16.3 64-bit (threaded or otherwise) & Tk 804.031 on CentOS 6 64-bit) causes core dump (but not when it is just run as in perl file) ...

  use Tk;
  #  Remove "BEGIN" and get no core dump.
  BEGIN
  { our $MW = MainWindow->new(); }

  __END__

  test-tk.pl syntax OK
  . (1):
  0 0x2ba31f0   NV f=00000002 undef(1)
  SV = IV(0x2ba31e0) at 0x2ba31f0
    REFCNT = 1
    FLAGS = ()
    IV = 0
[download]

There is no problem with combinations of ...

perl 5.8.8, Tk 804.0275;
perl 5.10.0, Tk 804.028; and
perl 5.14.2, Tk 804.03

... FWIW. Has anybody else seen the problem?

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