026 splice binding vs enclosing producer local

// Splice hygiene across nesting: a binding nested inside a spliced body must
// not collide with an *enclosing* producer's raw-|zig locals, and nested
// renames must not mask each other. Outer `k` collides with the producer
// local `k`; inner `i` collides with the producer's `|i|` capture — a name
// that only exists in the enclosing producer's frame, not the immediate
// `for` producer's.
~import std/io

~tor spin {}
! tick i64

~proc spin|zig {
    for (0..2) |i| {
        const k: i64 = @intCast(i);
        tick(k * 10);
    }
}

~spin()
! tick k |> for(0..2)
    ! each i |> std/io:print.ln("{{ k:d }} {{ i:d }}")