print correct column in error message

Cython/Compiler/Nodes.py

@@ -1906,9 +1906,9 @@ class DefNode(FuncDefNode):
             else:
                 arg.accept_none = True # won't be used, but must be there
                 if arg.not_none:
-                    error(self.pos, "Only Python type arguments can have 'not None'")
+                    error(arg.pos, "Only Python type arguments can have 'not None'")
                 if arg.or_none:
-                    error(self.pos, "Only Python type arguments can have 'or None'")
+                    error(arg.pos, "Only Python type arguments can have 'or None'")
 
     def analyse_signature(self, env):
         if self.entry.is_special:

tests/errors/e_notnone2.pyx

 def eggs(int x not None, char* y not None):
 	pass
 _ERRORS = u"""
-1:0: Only Python type arguments can have 'not None'
-1:0: Only Python type arguments can have 'not None'
+1: 9: Only Python type arguments can have 'not None'
+1:25: Only Python type arguments can have 'not None'
 """