POP-2

Robin POPplestone, Edinburgh, 1967

An innovative language incorporating many of Landin's ideas, including streams, closures, and functions as first-class citizens. Algol-like syntax. The first implementation was named Multi-POP, based on a function "REVPOL" written in POP-1, producing the reverse-polish form as output.

POP-2 Papers, Rod M. Burstall et al, Oliver & Boyd, 1968.

Programming in POP-2, Rod M. Burstall et al, Edinburgh University Press, 1971.

"POP-2 User's Manual", R. Popplestone, Machine Intelligence 2, E. Dale et al eds, Oliver and Boyd, Edinburgh 1968.