[Bug c++/50848] New: ICE in derived template class missing using for member of template base class

["cas43 at cs dot stanford.edu" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50848

             Bug #: 50848
           Summary: ICE in derived template class missing using for member
                    of template base class
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: cas43@cs.stanford.edu


Created attachment 25588
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25588
Source file causing ICE

Compiling the attached source file causes g++ to ICE.

Command to reproduce:  /home/cas43/new-gcc/inst/bin/g++ prog.cpp

System type: 64-bit Ubuntu Linux

Compiler version:

$ /home/cas43/new-gcc/inst/bin/g++ -v
Using built-in specs.
COLLECT_GCC=/home/cas43/new-gcc/inst/bin/g++
COLLECT_LTO_WRAPPER=/home/cas43/new-gcc/inst/libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../current-gcc/configure --prefix=/home/cas43/new-gcc/inst
Thread model: posix
gcc version 4.7.0 20111024 (experimental) (GCC) 

OUTPUT:

prog.cpp: In member function âvoid B<T>::f()â:
prog.cpp:2:53: error: there are no arguments to âuâ that depend on a template
parameter, so a declaration of âuâ must be available [-fpermissive]
prog.cpp:2:53: note: (if you use â-fpermissiveâ, G++ will accept your code, but
allowing the use of an undeclared name is deprecated)
prog.cpp: In instantiation of âvoid B<T>::f() [with T = int]â:
prog.cpp:3:16:   required from here
prog.cpp:2:50: error: âuâ was not declared in this scope, and no declarations
were found by argument-dependent lookup at the point of instantiation
[-fpermissive]
prog.cpp:2:50: internal compiler error: tree check: expected tree that contains
âdecl minimalâ structure, have âindirect_refâ in tsubst_copy_and_build, at
cp/pt.c:13526
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