// Atomic compare-exchange dual-ordering validation: the FAILURE ordering may not
// be stronger than the SUCCESS ordering (LLVM rule). Here failure=.seq_cst (rank
// 3) is stronger than success=.relaxed (rank 0) → loud diagnostic, not invalid IR.
// Stream A (atomics) A.2.
#import "modules/std.sx";
#import "modules/std/atomic.sx";

main :: () {
    a := Atomic(i64).init(0);
    _ := a.compare_exchange(0, 1, .relaxed, .seq_cst);
}