Workaround bug detecting MAKE_FUNCTION docstrings

uncompyle6/semantics/pysource.py

@@ -895,6 +895,12 @@ class SourceWalker(GenericASTTraversal, object):
         doc_node = node[0]
         if doc_node.attr:
             docstring = doc_node.attr
+            if not isinstance(docstring, str):
+                # FIXME: we have mistakenly tagged something as a doc
+                # string in transform when it isn't one.
+                # The rule in n_mkfunc is pretty flaky.
+                self.prune()
+                return
         else:
             docstring = node[0].pattr
 

uncompyle6/semantics/transform.py

@@ -95,10 +95,18 @@ class TreeTransform(GenericASTTraversal, object):
 
         code = find_code_node(node, code_index).attr
 
+        mkfunc_pattr = node[-1].pattr
+        if isinstance(mkfunc_pattr, tuple):
+            assert len(mkfunc_pattr, 4) and isinstance(mkfunc_pattr, int)
+            is_closure = node[-1].pattr[3] != 0
+        else:
+            # FIXME: This is what we had before. It is hoaky and probably wrong.
+            is_closure = mkfunc_pattr == "closure"
+
         if (
-            node[-1].pattr != "closure"
+            (not is_closure)
             and len(code.co_consts) > 0
-            and code.co_consts[0] is not None
+            and isinstance(code.co_consts[0], str)
         ):
             docstring_node = SyntaxTree(
                 "docstring", [Token("LOAD_STR", has_arg=True, pattr=code.co_consts[0])]