[perl #93652] PerlIO::via does not create a new dynamic scope for $1

On Mon Jun 27 16:13:21 2011, perlbug@spamwagon.com wrote:
> When PerlIO::via runs the WRITE stack (or possibly any stack),
> it does not appear to create a new dynamic scope for each layer
> method called.  Modifying the global regular expression match
> variables like $1 in a lower IO layer can cause $1 to have an
> unexpected value in the IO layer above.

You are right in saying ‘possibly any stack’. This is the same as bug
#22369. (But I disagree with the assessment in that ticket that it is
just a matter of documenting it. This *is* a bug that needs to be fixed,
IMO, since it is so counter-intuitive.)

• [perl #93652] PerlIO::via does not create a new dynamic scope for $1 by Father Chrysostomos via RT