py/objtype: Check and prevent delete/store on a fixed locals map.

Note that the check for elem!=NULL is removed for the
MP_MAP_LOOKUP_ADD_IF_NOT_FOUND case because mp_map_lookup will always
return non-NULL for such a case.

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/basics/setattr1.py b/tests/basics/setattr1.py
index 9693aca81..e4acb14ca 100644
--- a/tests/basics/setattr1.py
+++ b/tests/basics/setattr1.py
@@ -16,3 +16,10 @@ try:
     setattr(a, b'var3', 1)
 except TypeError:
     print('TypeError')
+
+# try setattr on a built-in function
+try:
+    setattr(int, 'to_bytes', 1)
+except (AttributeError, TypeError):
+    # uPy raises AttributeError, CPython raises TypeError
+    print('AttributeError/TypeError')