static a not of type int in a C++ programm?

[Peter Schmid]

int main()
{
    static a;
    a++;
    unsigned b;
    b++;
}
g++ -o t t.C
t.C: In function `int main()':
t.C:3: warning: ANSI C++ forbids declaration `a' with no type

If this is the new behaviour due to a change in the standard I suggest making
this an error instead of emitting a warning.
But I am not shure if this the correct behaviour. 
It compiles as a C programm without warnings. 

Peter Schmid