Added proper "need 'this' to access member foo" errors instead of "variable foo not resolved" for some cases, added FIXME for the old error! Added a bit more information to the runtime's cyclic dependency detection exception.

module strings2;

import std.string;
import std.stdio;

void main()
{
    int i = 32;
    auto str = format(i);
    writefln(str);

    long l = 123123;
    str = format(l);
    writefln(str);
}