Fix #245, crash on cimported struct -> object.

Cython/Compiler/PyrexTypes.py

@@ -1535,6 +1535,8 @@ class CStructOrUnionType(CType):
     #  typedef_flag  boolean
     #  packed        boolean
     
+    # entry          Entry
+    
     is_struct_or_union = 1
     has_attributes = 1
     
@@ -1563,8 +1565,7 @@ class CStructOrUnionType(CType):
                     self.to_py_function = None
                     self._convert_code = False
                     return False
-            entry = env.lookup(self.name)
-            forward_decl = (entry.visibility != 'extern')
+            forward_decl = (self.entry.visibility != 'extern')
             self._convert_code = StructUtilityCode(self, forward_decl)
         
         env.use_utility_code(self._convert_code)

Cython/Compiler/Symtab.py

@@ -363,6 +363,7 @@ class Scope(object):
             entry = self.declare_type(name, type, pos, cname,
                 visibility = visibility, defining = scope is not None)
             self.sue_entries.append(entry)
+            type.entry = entry
         else:
             if not (entry.is_type and entry.type.is_struct_or_union
                     and entry.type.kind == kind):

tests/run/crashT245.h

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

tests/run/crashT245.pyx

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