[C,C++] integer constants in attribute arguments

[Jason Merrill]

On 01/18/2014 05:33 PM, Marc Glisse wrote:
> So when we have: __attribute__((nonnull(bar,bar)))
> the parser will keep bar as an identifier for the first argument, but
> parse the second one as an expr-list and thus find the associated
> function_decl.

OK, that makes sense.  But why do we need to handle that specially? 
Isn't that an invalid argument whether or not it decays to a pointer?

Jason