// S : tags   error threads min c++  $TAGS
// S : expect --result error --location-comment ERROR
// S : cc     -o test.bc  $CC_OPT $file
// S : verify -o nofail:malloc $V_OPT test.bc

#include <thread>
#include <atomic>
#include <cassert>

std::atomic_int a;

int main() {
    std::thread t( [] {
            int r = a;
            assert( r == 0 || r == 2 ); /* ERROR */
        } );
    a = 1;
    a = 2;
    t.join();
}