ref: 496c846ff65f795f72af5a8c8163f2e032bd2859 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}