struct CallerInfo

{

    string file;

    size_t line;

}

​

void foo(CallerInfo cinfo = CallerInfo(__FILE__, __LINE__))

{

    import std.stdio;

    writeln(cinfo);

}

void foo2(string file = __FILE__, size_t line = __LINE__)

{

    import std.stdio;

    writeln(CallerInfo(file, line));

}

​

void main()

{

    foo();

    foo2();

}