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// Check that the compiler warns about inner-style forward declarations in

// contexts where they're not actually illegal, but merely useless.

// Verify warnings for and within classes, and by extension, struct and union.

class C1;

class C1::C2;      // { dg-error "does not name a type" }

class C1::C2::C3;  // { dg-error "has not been declared" }

class C1 {

 public:

  class C2;

  class C2::C3;    // { dg-error "does not name a type" }

  class C2 {

   public:

    class C3;

    class C3 { };

    class C3;

  };

  class C2;

  class C2::C3;    // { dg-warning "declaration 'class C1::C2::C3' does not declare anything" }

};

class C1;

class C1::C2;      // { dg-warning "declaration 'class C1::C2' does not declare anything" }

class C1::C2::C3;  // { dg-warning "declaration 'class C1::C2::C3' does not declare anything" }

// Verify warnings for namespace scopes.

class N1::C4;      // { dg-error "has not been declared" }

class N1::N2::C5;  // { dg-error "has not been declared" }

namespace N1 {

  class C4;

  class C4 { };

  class C4;

  class N2::C5;    // { dg-error "has not been declared" }

  namespace N2 {

    class C5;

    class C5 { };

    class C5;

  }

  class N2::C5;    // { dg-warning "declaration 'class N1::N2::C5' does not declare anything" }

}

class N1::C4;      // { dg-warning "declaration 'class N1::C4' does not declare anything" }

class N1::N2::C5;  // { dg-warning "declaration 'class N1::N2::C5' does not declare anything" }

// Verify that using declarations related to namespaces don't generate a

// warning.

using namespace N1;

using namespace N1::N2;

namespace N3 {

  using N1::C4;      // Valid using declaration, no warning

  using N1::N2::C5;  // Valid using declaration, no warning

}

// Verify that explicit template instantiations, easy to confuse with

// forward declarations, don't generate a warning.

template

class TC6 {

 public:

  class TC7 { };

};

template class TC6::TC7;  // Valid explicit instantiation, no warning

// Verify that friend declarations, also easy to confuse with forward

// declrations, are similarly not warned about.

class C8 {

 public:

  class C9 { };

};

class C10 {

 public:

  friend class C8::C9;         // Valid friend declaration, no warning

};