merge

Appends the structures contained in caps2 to this if they are not yet expressed by this.

The structures in caps2 are not copied -- they are transferred to a writable copy of this, and then caps2 is freed. If either caps is ANY, the resulting caps will be ANY.

Parameters:

this	the Caps that will take the new entries
caps2	the Caps to merge in

Returns:

the merged caps.