Please see bug report 9133.
Joaquín M Lopez has closed in on the problem from my original submission. Here is the gist of the problem:

// membspace.C
template <typename T>
class A {
  class A1{} A1;
};

template <typename T>
class B: public A<T> {};

int main(void)
{
  return 0;
}
//
booby:~/c++/bimap> alias g3
alias g3='/usr/local/products/gcc/3.2.1/bin/g++'
booby:~/c++/bimap> g3 -v      
Reading specs from /usr/local/products/gcc/3.2.1/lib/gcc-lib/sparc-sun-solaris2.8/3.2.1/specs
Configured with: ../gcc-3.2.1/configure --with-gnu-as --with-as=/usr/local/products/binutils/2.11.2/bin/gnu-as --with-gnu-ld --with-ld=/usr/local/products/binutils/2.11.2/bin/gnu-ld --disable-nls --enable-languages=c,c++ --disable-libgcj --disable-shared --prefix=/usr/local/products/gcc/3.2.1
Thread model: posix
gcc version 3.2.1
booby:~/c++/bimap> g3 membspace.C 
membspace.C:7: internal error: Segmentation Fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.

Release:
unknown

Environment:
UNIX/LINUX

How-To-Repeat:
Compile the sampple code provided above (repeated here):
// membspace.C
template <typename T>
class A {
  class A1{} A1;
};

template <typename T>
class B: public A<T> {};

int main(void)
{
  return 0;
}
//