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#| The function call_identity is supposed to be very boring, but here it is: int call_identity(int (*function)()) { return function(); } On macOS, I compiled this using the command: gcc -dynamiclib -o libidentity.dylib libidentity.c |# CL-USER> (cffi:load-foreign-library "/tmp/libidentity.dylib") #<CFFI:FOREIGN-LIBRARY LIBIDENTITY.DYLIB-554 "libidentity.dylib"> CL-USER> (cffi:defcallback makes-42 :int () 42) MAKES-42 CL-USER> (cffi:defcfun "call_identity" :int (function :pointer)) CALL-IDENTITY CL-USER> (call-identity (cffi:callback makes-42)) 42