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      1 // RUN: %clang_cc1 -I%S %s -triple x86_64-apple-darwin10 -emit-llvm -fcxx-exceptions -fexceptions -std=c++11 -o - | FileCheck %s
      2 struct A { virtual ~A(); };
      3 struct B final : A { };
      4 struct C { virtual ~C(); int c; };
      5 
      6 // CHECK: @_Z1fP1B
      7 C *f(B* b) {
      8   // CHECK-NOT: call i8* @__dynamic_cast
      9   // CHECK: ret %struct.C* null
     10   return dynamic_cast<C*>(b);
     11 }
     12 
     13 // CHECK: @_Z1fR1B
     14 C &f(B& b) {
     15   // CHECK-NOT: call i8* @__dynamic_cast
     16   // CHECK: call void @__cxa_bad_cast() [[NR:#[0-9]+]]
     17   // CHECK: ret %struct.C* undef
     18   return dynamic_cast<C&>(b);
     19 }
     20 
     21 void dont_crash() {
     22   (void) dynamic_cast<void*>((A*)0);
     23   (void) dynamic_cast<void*>((B*)0);
     24 }
     25 
     26 // CHECK: attributes [[NR]] = { noreturn }
     27