DELETE_FAST should issue an exception when the local variable is undefined.

2e4c899e · Guido van Rossum · 1a87e9d7 · 2e4c899e
Commit 2e4c899e authored May 12, 1998 by Guido van Rossum
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Python/ceval.c Python/ceval.c +7 -0

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--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -1337,6 +1337,13 @@ eval_code2(co, globals, locals,
 			continue;

 		case DELETE_FAST:
+			x = GETLOCAL(oparg);
+			if (x == NULL) {
+				PyErr_SetObject(PyExc_NameError,
+					   PyTuple_GetItem(co->co_varnames,
+							oparg));
+				break;
+			}
 			SETLOCAL(oparg, NULL);
 			continue;