I tested the posted code with

C:\>Perl-5.12\bin\perl.exe -v

This is perl 5, version 12, subversion 4 (v5.12.4) built for MSWin32-x
+86-multi-t
hread
(with 9 registered patches, see perl -V for more detail)

Copyright 1987-2010, Larry Wall

Binary build 1205 [294981] provided by ActiveState http://www.ActiveSt
+ate.com
Built Jun 20 2011 18:35:25
[download]

following the directions above and got multiple error codes, including:

• Out of memory!
  panic: leave_scope inconsistency at primes.pl line 13.
  [download]

• Can't coerce F♥ ns with other barewords, keywords, and
  subroutine names. Constant names must begin with a letter or
  underscore. Names beginning with a double underscore are reserved. Som
  +e
  poor choices for names will generate warnings, if warnings are enabled
  + at
  compiUNKNOWN to string in leave at primes.pl line 14.
  Use of uninitialized value in concatenation (.) or string at primes.pl
  + line 16.
  [download]

• Can't coerce UNKNOWN to string in   rds, keywords, and
  subroutine names. Constant names must begin with a letter or
  underscore. Names beginning with a double underscore are reserved. Som
  +e
  poor choices for names will generUNKNOWN ings, if warnings are enabled
  + at
  compile time.
  
  =head2 List constsubtract at primes.pl line 13.
  [download]

• Terminating on signal SIGINT(2)

• Can't coerce UNKNOWN to string in   £~è☺gt at primes.pl line 13.
  Use of uninitialized value in numeric gt (>) at primes.pl line 13.
  [download]

• Can't coerce UNKNOWN to string in t☺rds, keywords, and
  subroutine names. Constant names must begin with a letter or
  underscore. Names beginning with a double underscore are reserved. Som
  +e
  poor choices for namUNKNOWN KNOWN te warnings, if warnings are enabled
  + at
  compile time.
  2677 is prime.
  
  =head2 List constants
  
  Constants may be lists of munstack at primes.pl line 13.
  panic: leave_scope inconsistency at                 eir last value in
  scalar context as one might expect.  They currently return the number
  scalar context as one might expect.  They currently return the number
  Label not found for "next OUTER" at primes.pl line 14.
  Label not found for "next OUTER" at primes.pl line 14.
  of values, but B<this may change in the future>.  Do not use constants
  with multiple values in scalar context.
  
  B<NOTE:> This implies that the expression defining the value of a
  constant is evaluated in list context.  This primes.pl line 13.
  [download]

I don't know if this information is terribly diagnostically useful.

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