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// { dg-options "-std=c++0x" }

// [temp.alias]/3:

// The type-id in an alias template declaration shall not refer

// to the alias template being declared. The type produced by an

// alias template specialization shall not directly or indirectly

// make use of that specialization.

template  struct A;

template  using B = typename A::U; // { dg-error "type" }

template  struct A {

    typedef B U;

};

B b; // { dg-error "invalid type" }