commit 3b0431dc6019d2f9ffa9adcaa78ddd3f7b76a2f5
author Benjamin Peterson <benjamin@python.org> Tue Apr 30 09:41:40 2013 -0400
committer Benjamin Peterson <benjamin@python.org> Tue Apr 30 09:41:40 2013 -0400
tree 7f98ecba2e560776b91856eb74487c26c73d5d0d
parent f256f5f3ebf6574a2708cfea36d857846893e71f

check local class namespace before reaching for cells (closes #17853)

Python/compile.c

diff --git a/Python/compile.c b/Python/compile.c
index 52e8188..1ecbae8 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -970,6 +970,7 @@
         case LOAD_CLOSURE:
             return 1;
         case LOAD_DEREF:
+        case LOAD_CLASSDEREF:
             return 1;
         case STORE_DEREF:
             return -1;
@@ -2677,7 +2678,9 @@
     switch (optype) {
     case OP_DEREF:
         switch (ctx) {
-        case Load: op = LOAD_DEREF; break;
+        case Load:
+            op = (c->u->u_ste->ste_type == ClassBlock) ? LOAD_CLASSDEREF : LOAD_DEREF;
+            break;
         case Store: op = STORE_DEREF; break;
         case AugLoad:
         case AugStore: