text: // RUN: %clang_cc1 -o - -emit-interface-stubs %s | FileCheck %s
  
  // CHECK:      --- !experimental-ifs-v2
  // CHECK-NEXT: IfsVersion: 2.0
  // CHECK-NEXT: Triple:
  // CHECK-NEXT: ObjectFileFormat: ELF
  // CHECK-NEXT: Symbols:
  // CHECK-NEXT: ...
  
  // UnresolvedUsingTypenameDecl
  template<typename T> class C1 { using ReprType = unsigned; };
  template<typename T> class C2 : public C1<T> { using typename C1<T>::Repr; };
  