algol60: fix passing array slot as by-reference argument (PR 9895)
algol60: fix passing array slot as by-reference argument (PR 9895)

svn: r12373

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket