Merged revisions 67688 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r67688 | amaury.forgeotdarc | 2008-12-11 00:22:49 +0100 (jeu., 11 déc. 2008) | 6 lines

  #4559: When a context manager's __exit__() method returns an object whose
  conversion to bool raises an exception, 'with' loses that exception.

  Reviewed by Jeffrey Yasskin.
  Already ported to 2.5, will port to 2.6 and 3.0
........
diff --git a/Python/ceval.c b/Python/ceval.c
index 6eef7ef..dd1e171 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -2337,11 +2337,20 @@
 			/* XXX Not the fastest way to call it... */
 			x = PyObject_CallFunctionObjArgs(exit_func, u, v, w,
 							 NULL);
-			if (x == NULL) {
-				Py_DECREF(exit_func);
+			Py_DECREF(exit_func);
+			if (x == NULL)
 				break; /* Go to error exit */
-			}
-			if (u != Py_None && PyObject_IsTrue(x)) {
+
+			if (u != Py_None)
+				err = PyObject_IsTrue(x);
+			else
+				err = 0;
+			Py_DECREF(x);
+
+			if (err < 0)
+				break; /* Go to error exit */
+			else if (err > 0) {
+				err = 0;
 				/* There was an exception and a true return */
 				STACKADJ(-2);
 				Py_INCREF(Py_None);
@@ -2353,8 +2362,6 @@
 				/* The stack was rearranged to remove EXIT
 				   above. Let END_FINALLY do its thing */
 			}
-			Py_DECREF(x);
-			Py_DECREF(exit_func);
 			PREDICT(END_FINALLY);
 			break;
 		}