never executed always true always false

    1 {-# LANGUAGE DeriveGeneric, DeriveDataTypeable, DeriveFunctor, DeriveTraversable, DeriveFoldable #-}
    2 
    3 module Conjure.Language.Expression.Op.Minus where
    4 
    5 import Conjure.Prelude
    6 import Conjure.Language.Expression.Op.Internal.Common
    7 
    8 import qualified Data.Aeson as JSON             -- aeson
    9 import qualified Data.Aeson.KeyMap as KM
   10 
   11 import qualified Data.Vector as V               -- vector
   12 
   13 
   14 data OpMinus x = OpMinus x x
   15     deriving (Eq, Ord, Show, Data, Functor, Traversable, Foldable, Typeable, Generic)
   16 
   17 instance Serialize x => Serialize (OpMinus x)
   18 instance Hashable  x => Hashable  (OpMinus x)
   19 instance ToJSON    x => ToJSON    (OpMinus x) where toJSON = genericToJSON jsonOptions
   20 instance FromJSON  x => FromJSON  (OpMinus x) where parseJSON = genericParseJSON jsonOptions
   21 
   22 instance BinaryOperator (OpMinus x) where
   23     opLexeme _ = L_Minus
   24 
   25 instance (TypeOf x, Pretty x) => TypeOf (OpMinus x) where
   26     typeOf p@(OpMinus a b) = sameToSameToSame p a b
   27         [ TypeSet TypeAny
   28         , TypeMSet TypeAny
   29         , TypeFunction TypeAny TypeAny
   30         , TypeRelation [TypeAny]
   31         ]
   32         (\ ty -> case (?typeCheckerMode, ty) of
   33                     (StronglyTyped, TypeInt TagInt) -> True
   34                     (RelaxedIntegerTags, TypeInt{}) -> True
   35                     _ -> False
   36         )
   37 
   38 instance SimplifyOp OpMinus x where
   39     simplifyOp _ = na "simplifyOp{OpMinus}"
   40 
   41 instance Pretty x => Pretty (OpMinus x) where
   42     prettyPrec prec op@(OpMinus a b) = prettyPrecBinOp prec [op] a b
   43 
   44 instance VarSymBreakingDescription x => VarSymBreakingDescription (OpMinus x) where
   45     varSymBreakingDescription (OpMinus a b) = JSON.Object $ KM.fromList
   46         [ ("type", JSON.String "OpMinus")
   47         , ("children", JSON.Array $ V.fromList
   48             [ varSymBreakingDescription a
   49             , varSymBreakingDescription b
   50             ])
   51         ]