package DefUnused where

x :: Integer
x = let y = 17
    in 23

-- The binding made by the qualified is unused.
qualUnused :: (Bits a sa) => Module (Wire a)
qualUnused = module
  rw <- mkRWire
  interface Reg
    _write = rw.wset
    _read = validValue rw.wget
      when Valid v <- rw.wget

-- We can avoid the warning with an underscore prefix.
qualNotUnused :: (Bits a sa) => Module (Wire a)
qualNotUnused = module
  rw <- mkRWire
  interface Reg
    _write = rw.wset
    _read = validValue rw.wget
      when Valid _v <- rw.wget

ruleNameUsed :: Module Empty
ruleNameUsed = module
  r :: Reg (UInt 4) <- mkReg 0
  let name = "test"
  rules
    name: when True ==> r := r + 1
    "exit": when (r == 15) ==> $finish 0

ruleNameUnused :: Module Empty
ruleNameUnused = module
  r :: Reg (UInt 4) <- mkReg 0
  let name = "test"
  rules
    "test": when True ==> r := r + 1
    "exit": when (r == 15) ==> $finish 0