py/runtime: Properly handle passing user mappings to ** keyword args.

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/basics/fun_calldblstar3.py b/tests/basics/fun_calldblstar3.py
new file mode 100644
index 0000000000..4367e68df7
--- /dev/null
+++ b/tests/basics/fun_calldblstar3.py
@@ -0,0 +1,16 @@
+# test passing a user-defined mapping as the argument to **
+
+def foo(**kw):
+    print(sorted(kw.items()))
+
+class Mapping:
+    def keys(self):
+        return ['a', 'b', 'c']
+
+    def __getitem__(self, key):
+        if key == 'a':
+            return 1
+        else:
+            return 2
+
+foo(**Mapping())