Fix compiler.ast.flatten function so that it works on lists.

Tools/compiler/astgen.py

@@ -234,9 +234,9 @@ def main():
 """
 from consts import CO_VARARGS, CO_VARKEYWORDS
 
-def flatten(list):
+def flatten(seq):
     l = []
-    for elt in list:
+    for elt in seq:
         t = type(elt)
         if t is tuple or t is list:
             for elt2 in flatten(elt):
@@ -245,8 +245,8 @@ def flatten(list):
             l.append(elt)
     return l
 
-def flatten_nodes(list):
-    return [n for n in flatten(list) if isinstance(n, Node)]
+def flatten_nodes(seq):
+    return [n for n in flatten(seq) if isinstance(n, Node)]
 
 nodes = {}