ref: 9ebefcdc1b90b9e0e773b9b8f1afd01ac55c2a64 dir: /tests/Deriving.ref/
True False False True False True True True False True False A 'a' B False C 'a' 1 D A (A 'a') R{x='a',y=10} R{x=R{x='b',y=11},y=10}