python
diff --git a/‎Lib/compiler/misc.py‎
Lines changed: 18 additions & 0 deletions b/‎Lib/compiler/misc.py‎
Lines changed: 18 additions & 0 deletions
@@ -0,0 +1,18 @@
+class Set:
+    def __init__(self):
+	self.elts = {}
+    def add(self, elt):
+	self.elts[elt] = elt
+    def items(self):
+	return self.elts.keys()
+    def has_elt(self, elt):
+	return self.elts.has_key(elt)
+
+class Stack:
+    def __init__(self):
+	self.stack = []
+	self.pop = self.stack.pop
+    def push(self, elt):
+	self.stack.append(elt)
+    def top(self):
+	return self.stack[-1]