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      1 // RUN: %clang -mbackchain --target=s390x-linux -S -emit-llvm -o - %s | FileCheck %s
      2 
      3 // CHECK: define void @foo() [[NUW:#[0-9]+]]
      4 void foo(void) {
      5 }
      6 
      7 // CHECK: attributes [[NUW]] = { {{.*}} "backchain" {{.*}} }
      8