Issue #27358: Backported tests.

Lib/test/test_extcall.py

@@ -254,6 +254,21 @@ not function
       ...
     TypeError: h() argument after ** must be a mapping, not function
 
+    >>> h(**[])
+    Traceback (most recent call last):
+      ...
+    TypeError: h() argument after ** must be a mapping, not list
+
+    >>> h(a=1, **h)
+    Traceback (most recent call last):
+      ...
+    TypeError: h() argument after ** must be a mapping, not function
+
+    >>> h(a=1, **[])
+    Traceback (most recent call last):
+      ...
+    TypeError: h() argument after ** must be a mapping, not list
+
     >>> dir(**h)
     Traceback (most recent call last):
       ...