// ASM stream — indirect-memory (`=*m`) place output. The place address is passed
// to the asm as a pointer and the asm writes THROUGH it (no return slot): here
// `str x9, %[out]` stores 42 into `x`'s storage directly. Distinct from a
// write-through `=` output (which returns a value that is then stored). Mixes a
// value output and an input below to exercise operand ordering. aarch64-pinned;
// ir-only elsewhere (the `.ir` locks the `=*m` constraint + `elementtype` attr).
poke :: () -> i64 {
    x : i64 = 0;
    asm volatile {
        #string ASM
        mov x9, #42
        str x9, %[out]
ASM,
        [out] "=*m" -> @x,
        clobbers(.x9),
    };
    return x;   // 42 — written through the pointer
}
main :: () -> i64 { return poke(); }