% -----------------------------------------------------------------------------
-% $Id: PrelBase.lhs,v 1.48 2001/04/28 11:21:47 qrczak Exp $
+% $Id: PrelBase.lhs,v 1.49 2001/04/29 11:01:13 qrczak Exp $
%
% (c) The University of Glasgow, 1992-2000
%
return :: a -> m a
fail :: String -> m a
- m >> k = m >>= \_ -> k
+ m >> k = m >>= \_ -> k
fail s = error s
\end{code}
-- to avoid weird names like con2tag_[]#
-instance (Eq a) => Eq [a] where
+instance (Eq a) => Eq [a] where
{-# SPECIALISE instance Eq [Char] #-}
[] == [] = True
(x:xs) == (y:ys) = x == y && xs == ys
instance (Ord a) => Ord [a] where
{-# SPECIALISE instance Ord [Char] #-}
-
compare [] [] = EQ
compare [] (_:_) = LT
compare (_:_) [] = GT
(++) = append
{-# RULES
- "++" forall xs ys. (++) xs ys = augment (\c n -> foldr c n xs) ys
+"++" forall xs ys. (++) xs ys = augment (\c n -> foldr c n xs) ys
#-}
append :: [a] -> [a] -> [a]
it here seems more direct.)
\begin{code}
-data () = ()
+data () = ()
instance Eq () where
() == () = True
-- '>' uses compare, and therefore takes two primops instead of one.
instance Eq Char where
- (C# c1) == (C# c2) = c1 `eqChar#` c2
- (C# c1) /= (C# c2) = c1 `neChar#` c2
+ (C# c1) == (C# c2) = c1 `eqChar#` c2
+ (C# c1) /= (C# c2) = c1 `neChar#` c2
instance Ord Char where
- (C# c1) > (C# c2) = c1 `gtChar#` c2
- (C# c1) >= (C# c2) = c1 `geChar#` c2
- (C# c1) <= (C# c2) = c1 `leChar#` c2
- (C# c1) < (C# c2) = c1 `ltChar#` c2
+ (C# c1) > (C# c2) = c1 `gtChar#` c2
+ (C# c1) >= (C# c2) = c1 `geChar#` c2
+ (C# c1) <= (C# c2) = c1 `leChar#` c2
+ (C# c1) < (C# c2) = c1 `ltChar#` c2
{-# RULES
"x# `eqChar#` x#" forall x#. eqChar# x# x# = True
instance Ord Int where
compare = compareInt
-
- (<) = ltInt
- (<=) = leInt
- (>=) = geInt
- (>) = gtInt
+ (<) = ltInt
+ (<=) = leInt
+ (>=) = geInt
+ (>) = gtInt
compareInt :: Int -> Int -> Ordering
-(I# x) `compareInt` (I# y) = compareInt# x y
+(I# x#) `compareInt` (I# y#) = compareInt# x# y#
compareInt# :: Int# -> Int# -> Ordering
compareInt# x# y#
- | x# <# y# = LT
- | x# ==# y# = EQ
- | otherwise = GT
+ | x# <# y# = LT
+ | x# ==# y# = EQ
+ | otherwise = GT
\end{code}
(I# x) `leInt` (I# y) = x <=# y
{-# RULES
-"x# ># x#" forall x#. (>#) x# x# = False
+"x# ># x#" forall x#. (>#) x# x# = False
"x# >=# x#" forall x#. (>=#) x# x# = True
"x# ==# x#" forall x#. (==#) x# x# = True
"x# /=# x#" forall x#. (/=#) x# x# = False
-"x# <# x#" forall x#. (<#) x# x# = False
+"x# <# x#" forall x#. (<#) x# x# = False
"x# <=# x#" forall x#. (<=#) x# x# = True
#-}