// Standalone memory fence — fence(.ordering) → LLVM fence. Stream A (atomics) A.3.
// (.relaxed is rejected; see 1187.) Single-thread: a fence is observable only as
// "compiled + ran without error" here.
#import "modules/std.sx";
#import "modules/std/atomic.sx";

main :: () {
    a := Atomic(i64).init(1);
    a.store(2, .relaxed);
    fence(.release);
    a.store(3, .relaxed);
    fence(.acquire);
    fence(.seq_cst);
    print("after fences: {}\n", a.load(.relaxed)); // 3
}