http://www.perlmonks.org?node_id=424795


in reply to Re^6: Experimenting with Lvalue Subs (trade-offs)
in thread Experimenting with Lvalue Subs

Other problems:

How would this work in the proposed scheme? 

sub double
{
   $_[0] *= 2;
}

double($o->foo);

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Also currently 

$o->foo+ *= 2;

[download]
calls foo() once whereas it would need to call twice in the proposed scheme.

In Section Meditations