Ignore optional type parameters when comparing cpp classes.

This posed an issue when the type parameter was a typedef.

Cython/Compiler/PyrexTypes.py

@@ -3675,6 +3675,8 @@ class CppClassType(CType):
                 if self.templates == other_type.templates:
                     return 1
                 for t1, t2 in zip(self.templates, other_type.templates):
+                    if is_optional_template_param(t1) and is_optional_template_param(t2):
+                      break
                     if not t1.same_as_resolved_type(t2):
                         return 0
                 return 1

tests/run/cpp_stl.pyx

@@ -37,6 +37,16 @@ def test_vector(L):
         print v.at(i)
     del v
 
+ctypedef int my_int
+def test_vector_typedef(L):
+    """
+    >>> test_vector_typedef([1, 2, 3])
+    [1, 2, 3]
+    """
+    cdef vector[my_int] v = L
+    cdef vector[int] vv = v
+    return vv
+
 def test_vector_iterator(L):
     """
     >>> test_vector([11, 37, 389, 5077])