The following does not work

    import std.conv;
    import std.encoding;

    string s = "hello world";
    AsciiString t = to!(AsciiString)(s);

However, it is perfectly possible to do the transoding by using std.encoding functions alone.

    import std.encoding;

    string s = "hello world";
    AsciiString t;
    transcode(s,t);

Please fix std.conv.to so that it recognises AsciiString, Latin1String and Windows1252String, and can transcode between all string types.