SF patch 1547796 by Georg Brandl -- set literals.
diff --git a/Lib/compiler/pycodegen.py b/Lib/compiler/pycodegen.py
index cc197e3..af99045 100644
--- a/Lib/compiler/pycodegen.py
+++ b/Lib/compiler/pycodegen.py
@@ -1241,6 +1241,12 @@
             self.visit(elt)
         self.emit('BUILD_LIST', len(node.nodes))
 
+    def visitSet(self, node):
+        self.set_lineno(node)
+        for elt in node.items:
+            self.visit(elt)
+        self.emit('BUILD_SET', len(node.items))
+
     def visitSliceobj(self, node):
         for child in node.nodes:
             self.visit(child)