comptime type registry zig

registry.zig

var allComponentTypes: []type = undefined;

fn addComponent(comptime T: type) void {
    allComponentTypes = allComponentTypes ++ [1]type{T};
}

test "add component" {
    const Mover = struct {
        foo: bool,
    };

    addComponent(Mover);
}

>zig test registry.zig
registry.zig:4:25: error: unable to evaluate constant expression
    allComponentTypes = allComponentTypes ++ [1]type{T};
                        ^
registry.zig:12:17: note: called from here
    addComponent(Mover);
                ^