Nested tagged unions

[Sze]

I think you want something more like this:

switch (this.q) { // not tag(this.q)
    inline else => |u, tag|
        return u == @field(other.q, @tagName(tag)),
}

related topic:

Union Equality

I think this is kind of neat: pub fn equals(self: Value, other: Value) bool { return switch (self) { inline else => |value, tag| tag == std.meta.activeTag(other) and value == @field(other, @tagName(tag)), }; } This works because for nil it just compares that {} is equal to {} which is true. If any case should compare values differently like for example float, you can add it as an explicit case like this: pub fn equals(self: Value, other: Value) bool {…