internal compiler error gcc 2.91.57

[Davide Dell' Aquila]

 version:
 2.91.57
 
 system:
 cygwin and  linux
 
 command line:
 g++  error.cpp
 
 program:
 //////BEGIN error.cpp 
 template<class T> struct A{
      template<class T2> struct B{};
 };
 
int
 main(){
     A<char>::template B<int> a;    
 }
 ////////END error.cpp
 
 compiler message:
 Internal compiler error