Fix cpython_oldstyle_getattr_crash.py

It was just an error-message difference.

src/runtime/classobj.cpp

@@ -472,10 +472,18 @@ static Box* _instanceGetattribute(Box* _inst, BoxedString* attr_str, bool raise_
             return incref(inst->inst_cls);
     }
 
-    Box* attr = instanceGetattributeWithFallback<rewritable>(inst, attr_str, rewrite_args);
-    if (attr) {
-        return attr;
-    } else if (!raise_on_missing) {
+    try {
+        Box* attr = instanceGetattributeWithFallback<rewritable>(inst, attr_str, rewrite_args);
+        if (attr)
+            return attr;
+    } catch (ExcInfo e) {
+        if (!raise_on_missing && e.matches(AttributeError)) {
+            e.clear();
+            return NULL;
+        }
+        throw e;
+    }
+    if (!raise_on_missing) {
         return NULL;
     } else {
         raiseExcHelper(AttributeError, "%s instance has no attribute '%s'", inst->inst_cls->name->data(),

test/tests/cpython_oldstyle_getattr_crash.py

-# expected: reffail
 # This segfaults under python-dbg
 # (In a release build it "works" since the use-after-free happens without penalty.)
 
@@ -7,7 +6,7 @@ class C:
         del self
         print "C.__getattr__", attr
         del D.__get__
-        raise AttributeError()
+        raise AttributeError("our attribute error")
 
 class D(object):
     __get__ = C()

test/tests/generator_tracebacks.py

-# expected: reffail
 # Generators participate in the notional Python stack just like normal function calls do,
 # even if we implement them using separate C stacks.
 #

test/tests/inheritance.py

-# expected: reffail
 
 def f1():
     class C(object):