On Thu, Feb 24, 2011 at 9:41 AM, Dave Mitchell wrote:

This was fixed in a recent blead. Under blead, you get instead:

ok 1 - +, tied hash
ok 2 - +=, normal hash
# Operation "=": no method found, argument in overloaded package Test 
+at /tmp/p line 52.
...
[download]

because with a tie, it can't determine whether its safe to skip using the copy constructor, so it always calls it. Adding one, e.g.

   '=' => sub { bless [ @{$_[0]} ], 'Test' },
[download]

makes all three tests pass.

So starting with 5.14, you'll be able to do

use overload
    '+'  => \&append,
    '+=' => \&append,
    '='  => => sub { bless [ @{$_[0]} ], 'Test' };
[download]