make print translation for Abs_cfun consistent with other binders: prevent eta-contraction, but don't force eta-expansion
(* Classical Higher-order Logic -- batteries included *)
use_thys ["Library", "List_Prefix", "List_lexord", "Sublist_Order",
"Code_Char_chr", "Code_Integer", "Efficient_Nat", "Executable_Set"(*, "Code_Prolog"*)];