SF patch 1547796 by Georg Brandl -- set literals.

Tools/compiler/ast.txt

@@ -50,11 +50,11 @@ GenExprFor: assign, iter, ifs!
 GenExprIf: test
 List: nodes!
 Dict: items!
+Set: items!
 Not: expr
 Compare: expr, ops!
 Name: name*
 Global: names*
-Backquote: expr
 Getattr: expr, attrname*
 CallFunc: node, args!, star_args& = None, dstar_args& = None
 Keyword: name*, expr
@@ -97,7 +97,7 @@ init(Lambda):
         self.kwargs = 1
 
 init(GenExpr):
-    self.argnames = ['[outmost-iterable]']
+    self.argnames = ['.0']
     self.varargs = self.kwargs = None
 
 init(GenExprFor):

Tools/compiler/astgen.py

@@ -235,7 +235,7 @@ if __name__ == "__main__":
 
 This file is automatically generated by Tools/compiler/astgen.py
 """
-from consts import CO_VARARGS, CO_VARKEYWORDS
+from compiler.consts import CO_VARARGS, CO_VARKEYWORDS
 
 def flatten(seq):
     l = []