an alternative FCB for Abs_lst1; seems simpler but not as simple as I thought; not sure whether it generalises to multiple binders.
(* Title: Quotient_Syntax.thy
Author: Cezary Kaliszyk and Christian Urban
*)
header {* Pretty syntax for Quotient operations *}
(*<*)
theory Quotient_Syntax
imports Quotient
begin
notation
rel_conj (infixr "OOO" 75) and
fun_map (infixr "--->" 55) and
fun_rel (infixr "===>" 55)
end
(*>*)