GlobSolverFromEqSolver.EqSys
type v = Var2(S.LVar)(S.GVar).t
type d = Lattice.Lift2(S.G)(S.D).t
module Var : sig ... end
module Dom : sig ... end
val sys_change : (v -> d) -> v sys_change_info
Compute incremental constraint system change from old solution.