UPDATE: I'm still not sure if this should be considered a feature or a bug. It's not the same as with other "data" structures:
A subroutine isn't a data structure. Note that the same happens with other literals: 
#!/usr/bin/perl -l

sub gen_arr {
  my $inner =shift;

  print my $outer = \"foo";

  return $outer;
}

gen_arr gen_arr;
__END__
SCALAR(0x9400bc4)
SCALAR(0x9400bc4)

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If you really must create different addresses, use eval: 
my $outer = eval "sub {1;}";   # Different address each time.

[download]

In reply to Re: Avoiding reference of sub optimization by JavaFan
in thread Avoiding reference of sub optimization by LanX

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