A (shitty) attempt at XUnion
A (shitty) attempt at XUnion

This is broken mostly because of sizes. There are cases (e.g. when something
has a variable number of elements in a member list) where we can't state
excatly the size of the list at xcb-compile time. Instead, each structure
should have a Maybe size, where if it contains a (variable-length) list, its
size is unknown, while if it contains all statically known stuff, we can
compute the list.

tych0/xcffib