Testcase for #245

tests/run/crashT245.h

+typedef struct {
+    int x
+} MyStruct;
+

tests/run/crashT245.pyx

+cimport crashT245_pxd
+
+"""
+>>> f()
+{'x': 1}
+"""
+
+def f():
+    cdef crashT245_pxd.MyStruct s
+    s.x = 1
+    print s
+

tests/run/crashT245_pxd.pxd

+cdef extern from "crashT245.h":
+    ctypedef struct MyStruct:
+        int x
+