Under 5.005 this worked. I solved a "Can't use subscript on hash deref" error by changing your sort function (added the percent symbols). 
#!/usr/bin/perl

use strict; 

my %R = ( 'blah' => 5 );
my %S = ( 'blah' => 2 );
my %T = ( 'blah' => 3 );

my @barary = qw();
my @fooary = (\%R, \%S, \%T);

sub sortfunc { 
  %$a->{'blah'} cmp %$b->{'blah'};
}

@barary = sort sortfunc @fooary; 

print "$_->{blah} " foreach @barary;
print "\n";

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In reply to Re: Pseudo-hash intrusion... by mattr
in thread Pseudo-hash intrusion... by dragonchild

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