Improvements to 31c9a3 - CPAN code did depend on the previous behaviour of blessing filehandles into FileHandle

It turns out that it's not quite as simple as blessing into IO::File.
If you do (just) that, then it breaks any existing code that does
C<require IO::Handle;> to allow it to call methods on file handles,
because they're blessed into IO::File, which isn't loaded. (Note this code
doesn't assume that methods in IO::Seekable are there to be called)

So, it all should work if you also set @IO::File:::ISA correctly?
That way, code that assumes that methods from IO::Handle can be called will
work. However, gv.c now starts complaining (but not failing) if IO::Handle,
IO::Seekable and Exporter aren't present, because it goes looking for
methods in them.

So the solution seems to be to set @IO::File::ISA *and* create (empty)
stashes for the other 3 packages. Patch appended, but not applied.

1 files changed, 1 insertions, 0 deletions

diff --git a/MANIFEST b/MANIFEST
index 73395702a3..b065311f1d 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -4389,6 +4389,7 @@ t/op/exec.t			See if exec, system and qx work
 t/op/exists_sub.t		See if exists(&sub) works
 t/op/exp.t			See if math functions work
 t/op/fh.t			See if filehandles work
+t/op/filehandle.t		Tests for http://rt.perl.org/rt3/Ticket/Display.html?id=72586
 t/op/filetest.t			See if file tests work
 t/op/filetest_t.t		See if -t file test works
 t/op/flip.t			See if range operator works