HELP ISCLOSURE                                    Fran Evelyn, July 1985

    isclosure(<item>) -> <boolean>

ISCLOSURE is a recogniser procedure for closures. It returns <true> if
its argument is a closure, and <false> otherwise.

If the closure is "protected", ISCLOSURE will return 1 instead of
<true>.

See HELP
    *CLOSURES  - on the construction of closures in POP-11
    *PARTAPPLY - produces a closure of an existing procedure
    *PDPART    - returns the procedure on which a closure is based


--- C.all/help/isclosure
--- Copyright University of Sussex 1989. All rights reserved. ----------
