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Compiler projects using llvm 
// RUN: %clang_cc1 -no-opaque-pointers -Wno-implicit-function-declaration -triple x86_64-apple-darwin9 -fobjc-runtime=macosx-fragile-10.5 -emit-llvm -o %t %s
// RUN: grep -F 'declare i8* @objc_msgSend(i8* noundef, i8* noundef, ...)' %t

typedef struct objc_selector *SEL;
id f0(id x, SEL s) {
  return objc_msgSend(x, s);
}