package RecUpd(sysRecUpd) where

type T = Bit 5

struct S =
        a :: T
        b :: T
        c :: T
        d :: T
    deriving (Bits)

sysRecUpd :: Module Empty
sysRecUpd =
    module
        s :: Reg S
        s <- mkReg (S { b = 10; d = 10 })
        rules
            when s.b < s.d - 10
             ==> s := s { b = s.b + 1; c = negate s.c }
            when s.d < s.b - 10
             ==> s := s { d = s.d + 1; }