better error message

diff --git a/Cython/Compiler/Symtab.py b/Cython/Compiler/Symtab.py
index 14a205b948173baa551616c821b83a16df4b5149..ef56b4ed01f5c753e2060e4e0d9853b22268c924 100644 (file)
--- a/Cython/Compiler/Symtab.py
+++ b/Cython/Compiler/Symtab.py
@@ -1456,7 +1456,8 @@ class CClassScope(ClassScope):
         if not args:
             error(pos, "C method has no self argument")
         elif not args[0].type.same_as(self.parent_type):
-            error(pos, "Self argument of C method does not match parent type")
+            error(pos, "Self argument (%s) of C method '%s' does not match parent type (%s)" %
+                  (args[0].type, name, self.parent_type))
         entry = self.lookup_here(name)
         if entry:
             if not entry.is_cfunction: