// Stream B1 (fibers) — x86_64 sibling of 1800: `abi(.pure)` emits a naked
// function whose body is raw x86_64 asm (returns 42 in eax, then its own `ret`).
//
// Lowered via LLVM's `naked` attribute (no prologue/epilogue/frame). x86_64-
// pinned via `.build`: ir-only on a non-x86 host — the `.ir` snapshot locks the
// `naked` attribute + the bare asm body (`movl $42, %eax` / `ret`) and the
// frame-pointer-free attribute set — and runs end-to-end (exit 42) on
// x86_64-linux. The IR text (the `naked` attribute, the `call void asm`) is
// target-independent; only the asm string differs from the aarch64 1800.
answer :: () -> i64 abi(.pure) {
    asm volatile {
        #string A
        movl $42, %eax
        ret
A
    };
}

main :: () -> i64 { return answer(); }