zig err in rb.zig

txt

1/1 test "rb"...cast causes pointer to be null
/home/chris/Documents/Projects/ziglib/result/lib/zig/std/rb.zig:96:16: 0x206a84 in Node.getParent (test)
        return @intToPtr(*Node, node.parent_and_color & ~mask);
               ^
/home/chris/Documents/Projects/ziglib/result/lib/zig/std/rb.zig:181:30: 0x204f97 in Tree.insert (test)
        while (node.getParent()) |*parent| {
                             ^
/home/chris/Documents/Projects/ziglib/result/lib/zig/std/rb.zig:527:20: 0x2047fc in test "rb" (test)
    _ = tree.insert(&ns[1].node);
                   ^
/home/chris/Documents/Projects/ziglib/result/lib/zig/std/special/test_runner.zig:13:25: 0x2275fd in std.special.main (test)
        if (test_fn.func()) |_| {
                        ^
/home/chris/Documents/Projects/ziglib/result/lib/zig/std/special/start.zig:139:37: 0x226466 in std.special.posixCallMainAndExit (test)
            const result = root.main() catch |err| {
                                    ^
/home/chris/Documents/Projects/ziglib/result/lib/zig/std/special/start.zig:56:5: 0x2262ef in std.special._start (test)
    @noInlineCall(posixCallMainAndExit);
    ^

Tests failed. Use the following command to reproduce the failure:
/home/chris/Documents/Projects/ziglib/zig-cache/o/haTdgtOgTKSUKIODF6bqw8sBD_FnayU4Lz3yyQXWVH0N75QUo_CFL6tJYeTvjmJ5/test