Y
     
        1. General purpose language syntactically like {RATFOR},
        semantically like {C}.  Lacks structures and pointers.  Used
        as a source language for Jack W. Davidson and Christopher
        W. Fraser's peephole optimiser which inspired {GCC} {RTL} and
        other optimisation ideas.
     
        {(ftp://ftp.cs.princeton.edu/pub/y+po.tar.Z)}.  It is a copy
        of the original distribution from the {University of Arizona}
        during the early 80's, totally unsupported.
     
        ["The Y Programming Language", D.R. Hanson, SIGPLAN Notices
        16(2):59-68 (Feb 1981)].
     
        [Jack W. Davidson and Christopher W. Fraser, "The Design and
        Application of a Retargetable Peephole Optimiser", TOPLAS,
        Apr.  1980].
     
        [Jack W. Davidson, "Simplifying Code Through Peephole
        Optimisation" Technical Report TR81-19, The University of
        Arizona, Tucson, AZ, 1981].
     
        [Jack W. Davidson and Christopher W. Fraser, "Register
        Allocation and Exhaustive Peephole Optimisation"
        Software-Practice and Experience, Sep. 1984].
     
        2. See {fixed point combinator}.