cocoa:set-ns-range*

(cocoa:set-ns-range* range location length)

Sets an NSRange -- a cons, or a foreign object of the type -- to (location . length) and answers it. Part of the macOS-only cocoa package, beside objc. See the macOS GUI guide.

CL-USER> (objc:invoke-into 'string *s* "substringWithRange:" (cocoa:set-ns-range* (cons 0 0) 6 5))
"world"