[Bug c++/11764] [DR147] g++ does not treat injected class name correctly.

["jason at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11764

--- Comment #25 from Jason Merrill <jason at gcc dot gnu.org> 2013-03-15 13:36:11 UTC ---
(In reply to comment #24)
> OK, I read some explanations in the duplicates but still don't know why this
> should be valid code.

That is a question for the standards committee.

> IMO it makes no sense to write A:A:A:B and given the facts that
> 1) people don't write this intentionally
> 2) people expect this to be invalid (see number of duplicates)

And the cases that are invalid were fixed by my patch.

> 3) some other compiler don't compile this

Which?  Recent versions of EDG and clang both accept the testcase in comment
22.

> couldn't you at least give us a warning (e. g. with -pedantic)?

-pedantic means "strictly enforce the standard"; since the standard says that
the testcase in comment 22 is well-formed, -pedantic should not complain about
it.  Someone could add another warning flag to warn about this, but it isn't a
priority for me.