// Assigning to `list.items` writes exactly the items-pointer field even when
// the element type `T` is larger than the pointer (40-byte BigNode here), so
// a sibling field of the enclosing struct is not corrupted.

#import "modules/std.sx";

// 40-byte struct — triggers the bug.
// Shrink to [4]s64 (32 bytes) and the bug goes away.
BigNode :: struct {
    data: [5]s64;   // 40 bytes
}

Tree :: struct {
    nodes: List(BigNode);   // items(8) + len(8) + cap(8) = 24 bytes
    generation: s64;        // 8 bytes — total 32 bytes
}

Container :: struct {
    tree: Tree;
    sentinel: s64;

    do_work :: (self: *Container) {
        self.tree.nodes.items = xx 0;   // BUG: corrupts self.sentinel
    }
}

main :: () -> void {
    obj : *Container = xx context.allocator.alloc(size_of(Container));
    memset(obj, 0, size_of(Container));
    obj.sentinel = 0xDEADBEEF;

    print("size_of BigNode = {}\n", size_of(BigNode));
    print("before: sentinel = {}\n", obj.sentinel);

    obj.do_work();

    print("after:  sentinel = {}\n", obj.sentinel);
    if obj.sentinel != 0xDEADBEEF {
        print("BUG: sentinel was corrupted!\n");
    } else {
        out("OK\n");
    }
}