SKIP: FAILED

#include <metal_stdlib>
using namespace metal;

thread bool t = false;
bool4 m() {
  t = true;
  return bool4(t);
}
void f() {
  half4 v = half4(m());
}
program_source:4:13: error: program scope variable must reside in constant address space
thread bool t = false;
            ^
program_source:10:9: warning: unused variable 'v' [-Wunused-variable]
  half4 v = half4(m());
        ^