Why does this compile?

[George Mitchell]

On 09/26/17 00:38, Russell Haley wrote:
> [...]
> #include <netinet/in.h>
> 
> int main()
> {
>     struct in_pktinfo;
>     return 0;
> }
> [...]

This is a perfectly valid forward declaration of a struct type.  In
most normal cases, you would follow this up with something that contains
a pointer to a thing of that type, and later a full declaration of the
type.  As it stands, though, it's simply a statement to the compiler
that you are possibly using (and fully declaring) the structure type
later on in your program.                                 -- George

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