-{-# OPTIONS_GHC -fno-implicit-prelude #-}
+{-# OPTIONS_GHC -XNoImplicitPrelude #-}
-----------------------------------------------------------------------------
-- |
-- Module : Prelude
fst, snd, curry, uncurry,
#if defined(__NHC__)
- []((:), []), -- Not legal Haskell 98;
- -- ... available through built-in syntax
- module Data.Tuple, -- Includes tuple types
- ()(..), -- Not legal Haskell 98
- (->), -- ... available through built-in syntax
+ []((:), []), -- Not legal Haskell 98;
+ -- ... available through built-in syntax
+ module Data.Tuple, -- Includes tuple types
+ ()(..), -- Not legal Haskell 98
+ (->), -- ... available through built-in syntax
#endif
#ifdef __HUGS__
- (:), -- Not legal Haskell 98
+ (:), -- Not legal Haskell 98
#endif
-
+
-- ** Basic type classes
Eq((==), (/=)),
Ord(compare, (<), (<=), (>=), (>), max, min),
isInfinite, isDenormalized, isIEEE, isNegativeZero, atan2),
-- *** Numeric functions
- subtract, even, odd, gcd, lcm, (^), (^^),
+ subtract, even, odd, gcd, lcm, (^), (^^),
fromIntegral, realToFrac,
-- ** Monads and functors
Functor(fmap),
mapM, mapM_, sequence, sequence_, (=<<),
- -- ** String class
- IsString(fromString),
-
-- ** Miscellaneous functions
id, const, (.), flip, ($), until,
asTypeOf, error, undefined,
-- * List operations
map, (++), filter,
- head, last, tail, init, null, length, (!!),
+ head, last, tail, init, null, length, (!!),
reverse,
-- ** Reducing lists (folds)
foldl, foldl1, foldr, foldr1,
-- ** Converting from @String@
ReadS,
Read(readsPrec, readList),
- reads, readParen, read, lex,
-
+ reads, readParen, read, lex,
+
-- * Basic Input and output
IO,
-- ** Simple I\/O operations
#ifndef __HUGS__
import Control.Monad
import System.IO
-import Text.Read
-import Text.Show
import Data.List
import Data.Either
import Data.Maybe
-import Data.Bool
import Data.Tuple
-import Data.Eq
-import Data.Ord
#endif
#ifdef __GLASGOW_HASKELL__
import GHC.Base
import GHC.IOBase
-import GHC.Exception
-import GHC.Read
+import GHC.Exception ( throw )
+import Text.Read
import GHC.Enum
import GHC.Num
import GHC.Real
import GHC.Err ( error, undefined )
#endif
+#ifndef __HUGS__
+import qualified Control.Exception.Base as New (catch)
+#endif
+
#ifdef __HUGS__
import Hugs.Prelude
#endif
seq :: a -> b -> b
seq _ y = y
#endif
+
+#ifndef __HUGS__
+-- | The 'catch' function establishes a handler that receives any 'IOError'
+-- raised in the action protected by 'catch'. An 'IOError' is caught by
+-- the most recent handler established by 'catch'. These handlers are
+-- not selective: all 'IOError's are caught. Exception propagation
+-- must be explicitly provided in a handler by re-raising any unwanted
+-- exceptions. For example, in
+--
+-- > f = catch g (\e -> if IO.isEOFError e then return [] else ioError e)
+--
+-- the function @f@ returns @[]@ when an end-of-file exception
+-- (cf. 'System.IO.Error.isEOFError') occurs in @g@; otherwise, the
+-- exception is propagated to the next outer handler.
+--
+-- When an exception propagates outside the main program, the Haskell
+-- system prints the associated 'IOError' value and exits the program.
+--
+-- Non-I\/O exceptions are not caught by this variant; to catch all
+-- exceptions, use 'Control.Exception.catch' from "Control.Exception".
+catch :: IO a -> (IOError -> IO a) -> IO a
+catch = New.catch
+#endif /* !__HUGS__ */