Tuples: draft 1

[Benjamin Kosnik]

>I've looked at these tests, but it seems that they always list exactly 
>the errors which are produced. As I expect the definition of the tuple 
>header to change, and because I don't think the exact errors are 
>important, is there an easy way to do a { dg-do compile } , and then 
>simply say "this will fail", rather than having to give an exact list of 
>errors?

Two options.

1) XFAIL the whole test

2) use _neg, do-compile and update error messages as you change the
sources. It's not nearly as hard as you might think, IMHO.

-benjamin