Ok, here's what I want to do in pseudo-code: 

my $foo = { hash => 'ref' };
my $bar = { hash => 'ref' };

some_sub($foo);

$foo == $bar ...;  # should now be true!

sub some_sub {
  my $ref = shift;

  $ref = $bar; # except in Perl this just copies over
               # lexical $ref, not $foo!
}

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The problem is compounded by the fact that I don't control the call to some_sub().

In fact, in this case some_sub() is really a STORABLE_thaw() method and I'd like to take the reference Storable is giving me and make it instead point elsewhere, to an already existing reference.

I suspect this can't be done in pure Perl. I've looked at both Devel::LexAlias and Lexical::Alias, but neither one does what I want.

Hints of how to this in XS are welcome.

In reply to How to change referent of lexical reference? by autarch

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