> I wonder if this is an example of the stack not being ref-counted

I discussed it with Pali and he thinks it is a refcounting problem. It seems when iterating over values, the refcount of the current element is incremented, but all other elements keep their refcounts unchanged. Therefore, iterating over something doesn't prevent non-current elements from destruction. To see what happens, 

use Devel::Peek;

[download]
and prepend 
    Dump $hr3;

[download]
to the beginning of the loop.

For loop is implemented by a stack: pp_hot.c and pp_ctl.c.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re^6: Use of freed value in iteration by choroba
in thread Use of freed value in iteration by js1

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