Letrec case for singly-rec funs proved
compiler impl for general case of Letrec
val_rel updated for mutually rec funs
progress on App for general recursion
more accurate inv for ref ptrs
general App case almost finished
App case finished
general Letrec case almost proved
only one tricky cheat left
general Letrec case now cheat free
NIL, CONS and Tick cases proved
Var, If, Let, Raise verified
cases Handle and Call proved, clos-to-bvl
better code for for general Letrec
cEvalOp semantics filled in, refs have proper type
proved Op Ref case, only simple cases left
separated the easy Op cases from the main proof