c++/5981: expected class 't', have 'x' (identifier_node) (3.0 regression)

[Peter Schmid <schmid@snake.iap.physik.tu-darmstadt.de>]

>Number:         5981
>Category:       c++
>Synopsis:       expected class 't', have 'x' (identifier_node) (3.0 regression)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-illegal-code
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 16 06:06:11 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Peter Schmid
>Release:        3.1 20020313 (prerelease)
>Organization:
TU Darmstadt
>Environment:
System: Linux kiste 2.4.18 #8 Sat Mar 9 15:33:15 CET 2002 i686 unknown
Architecture: i686
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../gcc/configure --enable-shared --disable-nls --enable-threads --enable-languages=c,c++,f77,objc
>Description:
The following illformed code crashes gcc 3.1.
>How-To-Repeat:

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

g++ -v bug2.C -W -Wall
Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/specs
Configured with: ../gcc/configure --enable-shared --disable-nls --enable-threads --enable-languages=c,c++,f77,objc
Thread model: posix
gcc version 3.1 20020313 (prerelease)
 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/cc1plus -v -D__GNUC__=3 -D__GNUC_MINOR__=1 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux -Asystem=posix -D__NO_INLINE__ -D__STDC_HOSTED__=1 -D_GNU_SOURCE -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i686__ -D__tune_pentiumpro__ bug2.C -D__GNUG__=3 -D__DEPRECATED -D__EXCEPTIONS -D__GXX_ABI_VERSION=100 -quiet -dumpbase bug2.C -W -Wall -version -o /tmp/cc51HfcP.s
GNU CPP version 3.1 20020313 (prerelease) (cpplib) (i386 Linux/ELF)
GNU C++ version 3.1 20020313 (prerelease) (i686-pc-linux-gnu)
	compiled by GNU C version 3.1 20020313 (prerelease).
ignoring nonexistent directory "NONE/include"
ignoring nonexistent directory "/usr/local/i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include/g++-v3
 /usr/local/include/g++-v3/i686-pc-linux-gnu
 /usr/local/include/g++-v3/backward
 /usr/local/include
 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/include
 /usr/include
End of search list.
bug2.C:3: `ns' is not a class or namespace
bug2.C:3: tree check: expected class 't', have 'x' (identifier_node) in 
   make_typename_type, at cp/decl.c:5669
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.

>Fix:
	
>Release-Note:
>Audit-Trail:
>Unformatted: