c++/10585: Using typeof() for template parameters does not work (and ICEs on 3.3)

[giovannibajo@libero.it]

>Number:         10585
>Category:       c++
>Synopsis:       Using typeof() for template parameters does not work (and ICEs on 3.3)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Thu May 01 18:46:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Giovanni Bajo
>Release:        3.3 and 3.4 (CVS 20030430)
>Organization:
>Environment:
i686-pc-cygwin
>Description:
This is basically c++/4526, but epurated.

The following snippet does not compile on the active branch (3.3) and the mainline (3.4):

------------------------------------
struct X { typedef int type; };
X x;

template <typename T> struct A {
	typedef typename T::type type;
};

template <typename T> struct B {
	typename A<typeof(x)>::type y;
};

template class B<int>;
------------------------------------
pr4526.cpp:9: error: no type named `type' in `struct A<__typeof (x)>'
pr4526.cpp:9: error: ISO C++ forbids declaration of `y' with no type

3.3 CVS 20030421 even ICEs with this code snippet.

Note also that this bug might be related to c++/8007.
>How-To-Repeat:
Compile the above snippet
>Fix:
No known fix.
>Release-Note:
>Audit-Trail:
>Unformatted: