struct CodepointSet
{
    CodepointSet opBinary(string op, U)(U )
    {
        return this;
    }

    this(this) { }
}

CodepointSet memoizeExpr(string expr)()
{
    if (__ctfe)
        return mixin(expr);
    CodepointSet slot;
    return slot;
}

void wordCharacter() {
    // TODO: Check for no call to @llvm.lifetime for `__copytmp` sret
    memoizeExpr!"unicode.A | unicode.M";
}

struct unicode
{
    static CodepointSet opDispatch(string name)()
    {
        CodepointSet set;
        return set;
    }
}

struct Grapheme
{
    /// Ctor
    this(C)(C) { }

    this(this) { }

    ~this()    { }
}

enum jamoLBase = 0x1100;

Grapheme decomposeHangul(dchar ch) {
    immutable idxS = ch ;
    immutable idxT = idxS ;

    immutable partL = jamoLBase ;
    //TODO: Check for no call to `@llvm.lifetime` for `__sl` sret
    if (idxT )
        return Grapheme(partL);
    return Grapheme();
}