(,function ,(concatenate 'simple-string what " at #X~X")
(with-alien ((context (* os-context-t) context))
(sap-int (sb!vm:context-pc context)))))))
(,function ,(concatenate 'simple-string what " at #X~X")
(with-alien ((context (* os-context-t) context))
(sap-int (sb!vm:context-pc context)))))))