bench.d

enum isEven(alias i) = i % 2 is 0;
void main()
{
    import std.stdio;
    import std.range: iota, join;
    import std.algorithm.iteration: map;
    import std.conv: to;
    import std.meta: AliasSeq, Filter;
    enum types = "AliasSeq!(" ~ iota(0,1000).map!(i => to!string(i)).join(",") ~ ")";
    writeln(types);

    alias t = AliasSeq!(mixin(types));
    alias evenTypes = Filter!(isEven,t);
}