py: Properly implement deletion of locals and derefs, and detect errors.

Needed to reinstate 2 delete opcodes, to specifically check that a local
is not deleted twice.

1 files changed, 25 insertions, 0 deletions

diff --git a/tests/basics/del-local.py b/tests/basics/del-local.py
new file mode 100644
index 0000000000..05aa98b424
--- /dev/null
+++ b/tests/basics/del-local.py
@@ -0,0 +1,25 @@
+# delete local then try to reference it
+def f():
+    x = 1
+    y = 2
+    print(x, y)
+    del x
+    print(y)
+    try:
+        print(x)
+    except NameError:
+        print("NameError");
+f()
+
+# delete local then try to delete it again
+def g():
+    x = 3
+    y = 4
+    print(x, y)
+    del x
+    print(y)
+    try:
+        del x
+    except NameError:
+        print("NameError");
+g()