Created attachment 23933 [details]
Preprocessed broken_decltype.cpp

Hello All,

The following innocent-looking code crashes the compiler:

template <typename T>
struct Handle
{
    Handle(T& t);
};

template<class T>
struct Class {
    struct Struct {} data;
    void f();
    void g();
};

template<class T>
void Class<T>::f() {
    Handle< decltype((data)) > handle(data);
}

template<class T>
void Class<T>::g() {
    Handle< decltype((data)) > handle(data);
}

The command line and compiler output were:

g++ -std=g++0x broken_decltype.cpp (see attachment for detailed flags)

broken_decltype.cpp: In member function ‘void Class<T>::g()’:
broken_decltype.cpp:21:30: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate

This fails on multiple distributions including Linux 2.6.35.6-45.fc14.x86_64,
GNU C++ (GCC) version 4.5.1 20100924 (Red Hat 4.5.1-4) (x86_64-redhat-linux)
compiled by GNU C version 4.5.1 20100924 (Red Hat 4.5.1-4), GMP version 4.3.1, MPFR version 2.4.2, MPC version 0.8.1

Cheers!

David.