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structs called by reference only


Turning struct WINDOW pointers into Scheme integers is not the right
approach.  If someone passes the wrong integer to your functions, the
integer will get turned into a stray pointer, and Guile will crash.

Turn them into smobs; you can type-check those.  For more information,
see:

ftp://ftp.red-bean.com/pub/jimb/data-rep.texi