I believe I found an unintentional syntax error with a combination of 
decorators, parenthesis, and dots. Here's a demonstration:

class C:
    def prop(self, function):
        return property(function)

class F:
    @C().prop
    def foo(self):
        return 5

Which errors out with:

  File "foo.py", line 6
    @C().prop
        ^
SyntaxError: invalid syntax

I can't imagine why this would be desired, since these equivalent forms 
work:

class D:
    def foo(self):
        return 5
    foo = C().prop(foo)

class E:
    c = C()
    @c.prop
    def foo(self):
        return 5