Allow taking address of fake references.

This fixes #1519.

Cython/Utility/ModuleSetupCode.c

@@ -466,6 +466,7 @@ class __Pyx_FakeReference {
     // Const version needed as Cython doesn't know about const overloads (e.g. for stl containers).
     __Pyx_FakeReference(const T& ref) : ptr(const_cast<T*>(&ref)) { }
     T *operator->() { return ptr; }
+    T *operator&() { return ptr; }
     operator T&() { return *ptr; }
     // TODO(robertwb): Delegate all operators (or auto-generate unwrapping code where needed).
     template<typename U> bool operator ==(U other) { return *ptr == other; }

tests/wrappers/cpp_references.pyx

@@ -5,6 +5,7 @@ cimport cython
 
 cdef extern from "cpp_references_helper.h":
     cdef int& ref_func(int&)
+    cdef int& except_ref_func "ref_func" (int&) except +
 
     cdef int ref_var_value
     cdef int& ref_var
@@ -29,6 +30,16 @@ def test_ref_func_address(int x):
     cdef int* i_ptr = &ref_func(x)
     return i_ptr[0]
 
+def test_except_ref_func_address(int x):
+    """
+    >>> test_except_ref_func_address(5)
+    5
+    >>> test_except_ref_func_address(7)
+    7
+    """
+    cdef int* i_ptr = &except_ref_func(x)
+    return i_ptr[0]
+
 def test_ref_var(int x):
     """
     >>> test_ref_func(11)