zig/doc/langref/anonymous_struct_name.zig

const Node = struct {
    next: ?*Node,
    name: []const u8,
};

var node_a = Node{
    .next = null,
    .name = "Node A",
};

var node_b = Node{
    .next = &node_a,
    .name = "Node B",
};

// syntax