ldc crash

package.d

enum Font
{
    bold      ,
    underline ,
}

struct TextStyle
{
auto opBinary(string op)(ubyte other)     {
        return other ? TextStyle: this;
    }

}

template StyleImpl(ubyte styleCode)
{
auto StyleImpl()
    {
        return TextStyle();
    }
auto StyleImpl(TextStyle otherStyle)
    {
        return otherStyle ~ styleCode;
    }
}

alias bold         = StyleImpl!(Font.bold);
alias underline    = StyleImpl!(Font.underline);

struct Style
{
    TextStyle programName;
    enum Default = Style(
        bold.underline    );
}

run.bat

ldc2.exe package.d