3.6+ lambda params; add semantic rule customizing for lambdas

uncompyle6/parser.py

@@ -101,7 +101,6 @@ class PythonParser(GenericASTBuilder):
            many arguments it has. Often it is not used.
         """
         if rule not in self.new_rules:
-            # print("XXX ", rule) # debug
             self.new_rules.add(rule)
             self.addRule(rule, nop_func)
             customize[opname] = arg_count

uncompyle6/semantics/make_function.py

@@ -798,7 +798,7 @@ def make_function3(self, node, is_lambda, nested=1, code_node=None):
                 params.reverse()
         else:
             params.append("*%s" % code.co_varnames[argc])
-        if not is_lambda:
+        if not is_lambda or self.version >= 3.6:
             argc += 1
 
     # dump parameter list (with default values)

uncompyle6/semantics/pysource.py

@@ -484,7 +484,7 @@ class SourceWalker(GenericASTTraversal, object):
         else:
             # We can't comment out like above because there may be a trailing ')'
             # that needs to be written
-            assert len(node) == 3 and node[2] == "LAMBDA_MARKER"
+            assert len(node) == 3 and node[2] in ("RETURN_VALUE_LAMBDA", "LAMBDA_MARKER")
             self.preorder(node[0])
             self.prune()
 
@@ -2366,6 +2366,7 @@ class SourceWalker(GenericASTTraversal, object):
                 p_insts = self.p.insts
                 self.p.insts = self.scanner.insts
                 ast = python_parser.parse(self.p, tokens, customize)
+                self.customize(customize)
                 self.p.insts = p_insts
             except (python_parser.ParserError, AssertionError) as e:
                 raise ParserError(e, tokens)