[PATCH] Raw string support

[Jason Merrill]

Jakub Jelinek wrote:
> Looking at n2857.pdf, I don't see any progress about whether chars outside
> of basic source charset should be accepted or rejected in d-char-sequences
> in C++

It seems pretty clear to me that they should be rejected:

d-char:
       any member of the basic source character set except:
            space, the left square bracket [, the right square bracket ],
            and the control characters representing horizontal tab,
            vertical tab, form feed, and newline.

The patch looks OK to me from a C++ perspective.

Jason