llvm-project/clang/test/Parser/cxx0x-rvalue-reference.cpp

// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s

int && r1(int &&a);

typedef int && R;
void r2(const R a) { // expected-warning {{'const' qualifier on reference type 'R' (aka 'int &&') has no effect}}
  int & &&ar = a; // expected-error{{'ar' declared as a reference to a reference}}
}