new test for pointer operations

tests/run/pointers.pyx

+
+cdef char* c_string = b'abcdefg'
+cdef void* void_ptr = c_string
+
+def compare():
+    """
+    >>> compare()
+    True
+    True
+    True
+    False
+    False
+    """
+    print c_string == c_string
+    print c_string == void_ptr
+    print c_string is void_ptr
+    print c_string != void_ptr
+    print c_string is not void_ptr
+
+def if_tests():
+    """
+    >>> if_tests()
+    True
+    """
+    if c_string == void_ptr:
+        print True
+    if c_string != void_ptr:
+        print False
+
+def bool_binop():
+    """
+    >>> bool_binop()
+    True
+    """
+    if c_string == void_ptr and c_string == c_string:
+        print True
+
+def bool_binop_truth(int x):
+    """
+    >>> bool_binop_truth(1)
+    True
+    True
+    >>> bool_binop_truth(0)
+    True
+    """
+    if c_string and void_ptr and c_string == c_string:
+        print True
+    if c_string and x or not void_ptr or x:
+        print True