class ForwardDeclaredTypeTrait(HasTraits):
value = ForwardDeclaredType('ForwardDeclaredBar', allow_none=True)
class ForwardDeclaredTypeListTrait(HasTraits):
value = List(ForwardDeclaredType('ForwardDeclaredBar'))
class ForwardDeclaredTypeTrait(HasTraits):
value = ForwardDeclaredType('ForwardDeclaredBar')