text: // RUN: %clang_cc1 -o - -emit-interface-stubs %s | FileCheck %s
  
  // CHECK:      --- !experimental-ifs-v1
  // CHECK-NEXT: IfsVersion: 1.0
  // CHECK-NEXT: Triple:
  // CHECK-NEXT: ObjectFileFormat: ELF
  // CHECK-NEXT: Symbols:
  // CHECK-NEXT: ...
  
   // ConstructorUsingShadowDecl
  struct Base { Base(int); };
  struct Derived : public Base { using Base::Base; };
  