SKIP: FAILED

#include <metal_stdlib>
using namespace metal;

thread int x_1 = 0;
void main_1() {
  int const x_2 = x_1;
}
fragment void tint_symbol(uint x_1_param [[sample_id]]) {
  x_1 = as_type<int>(x_1_param);
  main_1();
}
program_source:4:12: error: program scope variable must reside in constant address space
thread int x_1 = 0;
           ^
program_source:6:13: warning: unused variable 'x_2' [-Wunused-variable]
  int const x_2 = x_1;
            ^