[Vala] Strange error from glib-2.0.vapi

["Michael B. Trausch" <mike trausch us>]

Another question I have where I am trying to figure out if I am doing
it wrong, or if there is a bug:

glib-2.0.vapi:1229.2-1229.18: error: The value type `GLib.Pid` doesn't
declare a GValue set function
        public struct Pid {
        ^^^^^^^^^^^^^^^^^

I am clueless as to why it wants something else.  I thought a GLib.Pid
was an integer value.

This is with Vala 0.6 release.

        --- Mike