The following fails to compile

    import std.typecons;

    void main()
    {
        Tuple!(int,string) t;
    }

The error message reported by the compiler is:

attribute argument to mixin must be a string, not ("int _0;\x0atemplate field(int i : 0) { alias _0 field; }\x0aalias _0 " ~ (invariant(char)[]) ~ ";\x0a" ~ "")

J