Merge of the release22 branch changes back into the trunk.

Lib/compiler/ast.py

@@ -282,6 +282,21 @@ class Module(Node):
     def __repr__(self):
         return "Module(%s, %s)" % (repr(self.doc), repr(self.node))
 
+class Expression(Node):
+    # Expression is an artifical node class to support "eval"
+    nodes["expression"] = "Expression"
+    def __init__(self, node):
+        self.node = node
+
+    def getChildren(self):
+        return self.node,
+
+    def getChildNodes(self):
+        return self.node,
+
+    def __repr__(self):
+        return "Expression(%s)" % (repr(self.node))
+
 class UnaryAdd(Node):
     nodes["unaryadd"] = "UnaryAdd"
     def __init__(self, expr):

Lib/compiler/pycodegen.py

@@ -34,6 +34,7 @@ EXCEPT = 2
 TRY_FINALLY = 3
 END_FINALLY = 4
 
+# XXX this doesn't seem to be used
 class BlockStack(misc.Stack):
     __super_init = misc.Stack.__init__
 
@@ -351,6 +352,13 @@ class CodeGenerator:
         self.emit('LOAD_CONST', None)
         self.emit('RETURN_VALUE')
 
+    def visitExpression(self, node):
+        self.set_lineno(node)
+        self.scopes = self.parseSymbols(node)
+        self.scope = self.scopes[node]
+        self.visit(node.node)
+        self.emit('RETURN_VALUE')
+
     def visitFunction(self, node):
         self._visitFuncOrLambda(node, isLambda=0)
         if node.doc:
@@ -1158,9 +1166,7 @@ class ExpressionCodeGenerator(NestedScopeMixin, CodeGenerator):
     def __init__(self, tree):
         self.graph = pyassem.PyFlowGraph("<expression>", tree.filename)
         self.__super_init()
-        self.set_lineno(tree)
         walk(tree, self)
-        self.emit('RETURN_VALUE')
 
     def get_module(self):
         return self
@@ -1181,6 +1187,7 @@ class InteractiveCodeGenerator(NestedScopeMixin, CodeGenerator):
 
     def get_module(self):
         return self
+    
     def visitDiscard(self, node):
         # XXX Discard means it's an expression.  Perhaps this is a bad
         # name.
@@ -1299,7 +1306,6 @@ class ClassCodeGenerator(NestedScopeMixin, AbstractClassCode, CodeGenerator):
         self.__super_init(klass, scopes, module)
         self.graph.setFreeVars(self.scope.get_free_vars())
         self.graph.setCellVars(self.scope.get_cell_vars())
-##        self.graph.setFlag(CO_NESTED)
 
 def generateArgList(arglist):
     """Generate an arg list marking TupleArgs"""

Lib/compiler/symbols.py

@@ -206,6 +206,8 @@ class SymbolVisitor:
         scope = self.module = self.scopes[node] = ModuleScope()
         self.visit(node.node, scope)
 
+    visitExpression = visitModule
+
     def visitFunction(self, node, parent):
         parent.add_def(node.name)
         for n in node.defaults:

Lib/compiler/transformer.py

@@ -172,7 +172,7 @@ class Transformer:
     def eval_input(self, nodelist):
         # from the built-in function input()
         ### is this sufficient?
-        return self.com_node(nodelist[0])
+        return Expression(self.com_node(nodelist[0]))
 
     def funcdef(self, nodelist):
         # funcdef: 'def' NAME parameters ':' suite

Lib/test/test_cpickle.py

@@ -80,6 +80,13 @@ class cPickleFastPicklerTests(AbstractPickleTests):
                           AbstractPickleTests.test_recursive_multi,
                           self)
 
+    def test_nonrecursive_deep(self):
+        a = []
+        for i in range(100):
+            a = [a]
+        b = self.loads(self.dumps(a))
+        self.assertEqual(a, b)
+
 def test_main():
     loader = unittest.TestLoader()
     suite = unittest.TestSuite()