From 01fe320c3ef9da3c015d9c010222419480792ccb Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@drexel.edu>
Date: Thu, 3 Mar 2011 09:33:55 -0500
Subject: [PATCH] Add Binding.visibility_string() for composing error messages.

---
 Cython/Compiler/Binding.py | 10 +++++++++-
 Cython/Compiler/Parsing.py |  2 +-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/Cython/Compiler/Binding.py b/Cython/Compiler/Binding.py
index 12e078b1..0097c326 100644
--- a/Cython/Compiler/Binding.py
+++ b/Cython/Compiler/Binding.py
@@ -104,4 +104,12 @@ class PythonBinding(_BindingAttributes):
 
 class Binding(CSource, CBinding, PythonBinding):
     "Combine all binding attributes in a single, flat namespace."
-    pass
+    def visibility_string(self):
+        "Summarize binding visibility in a single string"
+        if self.extern:
+            extern_string = ' (extern)'
+        else:
+            extern_string = ''
+        return 'C: %s%s, Python: %s' % (
+            self.c_visibility, extern_string, self.visibility)
+            
diff --git a/Cython/Compiler/Parsing.py b/Cython/Compiler/Parsing.py
index fe6dde20..5644a355 100644
--- a/Cython/Compiler/Parsing.py
+++ b/Cython/Compiler/Parsing.py
@@ -2946,7 +2946,7 @@ def p_c_class_definition(s, pos,  ctx, decorators=None):
         if ctx.api:
             error(pos, "Only 'public' C class can be declared 'api'")
     else:
-        error(pos, "Invalid class visibility '%s'" % visibility)
+        error(pos, "Invalid class visibility '%s'" % ctx.visibility_string())
     return Nodes.CClassDefNode(pos,
         extern = ctx.extern,
         c_visibility = ctx.c_visibility,
-- 
2.26.2