Bitfield conversion bug in 4.2?

[Eric Lemings]

Hi,
 
The following code compiles fine in GCC 4.1.
 
        enum E { e };
        struct S {
          E v:5;
        };
        S s;
        int main() { if (!s.v) return 0; }

In 4.2 (20070307), it gives the following error:

        test.cpp: In function 'int main()':
        test02.cpp:6: error: could not convert 's.S::v' to 'bool'
        test02.cpp:6: error: in arguument to unary !

Is this a bug or new behavior?  If the latter, what is this attributed
to?
 
Thanks,
Eric.