llvm-gcc-4.2/gcc/testsuite/llvm.objc/2007-10-23-GC-WriteBarrier.m

/* { dg-do compile } */
/* { dg-options "-fobjc-gc" } */
/* rdar:5541393 */
typedef unsigned int NSUInteger;
__attribute__((objc_gc(strong))) float *_scores;

void foo(int i, float f) {
  _scores[i] = f; 
}