Issue #2335: Backport set literals syntax from Python 3.x.
diff --git a/Lib/compiler/pyassem.py b/Lib/compiler/pyassem.py
index be0255d..88510de 100644
--- a/Lib/compiler/pyassem.py
+++ b/Lib/compiler/pyassem.py
@@ -734,6 +734,8 @@
         return -count+1
     def BUILD_LIST(self, count):
         return -count+1
+    def BUILD_SET(self, count):
+        return -count+1
     def CALL_FUNCTION(self, argc):
         hi, lo = divmod(argc, 256)
         return -(lo + hi * 2)