src/HOL/Quickcheck_Examples/Quickcheck_Nesting_Example.thy

treat map_filter similar to list_all, list_ex, list_ex1

theory Quickcheck_Nesting_Example
imports Quickcheck_Nesting
begin

datatype x = X "x list"

lemma "X a = X b"
quickcheck[exhaustive, size = 4, expect = counterexample]
oops

end