| ⊦ flatten(val ++ boolval(boolvar)) = flatten(val) ++ boolval(boolvar) |
⊦ flatten(val ++ boolval(true)) = flatten(val) ++ boolval(true)
⊦ flatten(val ++ boolval(false)) = flatten(val) ++ boolval(false)
[[CONCRETESIMPRULES : ([CSIMPGEN : bool generated by true, false;])]]