Make decorators an attribute of PyClassDefNode

Cython/Compiler/Nodes.py

@@ -3793,7 +3793,7 @@ class PyClassDefNode(ClassDefNode):
     #  target   NameNode   Variable to assign class object to
 
     child_attrs = ["body", "dict", "metaclass", "mkw", "bases", "class_result",
-                   "target", "class_cell"]
+                   "target", "class_cell", "decorators"]
     decorators = None
     class_result = None
     py3_style_class = False # Python3 style class (bases+kwargs)
@@ -3910,6 +3910,7 @@ class PyClassDefNode(ClassDefNode):
                     decorator.pos,
                     function = decorator.decorator,
                     args = [class_result])
+            self.decorators = None
         self.class_result = class_result
         self.class_result.analyse_declarations(env)
         self.target.analyse_target_declaration(env)

tests/run/decorator_lambda.pyx

+# mode: run
+# tag: decorator, lambda
+
+def decorate(f):
+    return f
+
+@decorate(lambda x: x)
+class TestClassDecorator(object):
+    """
+    >>> obj = TestClassDecorator()
+    >>> obj.hello()
+    'Hello, world!'
+    """
+    def hello(self):
+        return "Hello, world!"