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<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS_GHC -XNoImplicitPrelude -XBangPatterns #-}</span>
<a name="line-2"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : Prelude</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) The University of Glasgow 2001</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD-style (see the file libraries/base/LICENSE)</span>
<a name="line-7"></a><span class='hs-comment'>-- </span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer : libraries@haskell.org</span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : stable</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- The Prelude: a standard module imported by default into all Haskell</span>
<a name="line-13"></a><span class='hs-comment'>-- modules. For more documentation, see the Haskell 98 Report</span>
<a name="line-14"></a><span class='hs-comment'>-- <<a href="http://www.haskell.org/onlinereport/">http://www.haskell.org/onlinereport/</a>>.</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Prelude</span> <span class='hs-layout'>(</span>
<a name="line-19"></a>
<a name="line-20"></a> <span class='hs-comment'>-- * Standard types, classes and related functions</span>
<a name="line-21"></a>
<a name="line-22"></a> <span class='hs-comment'>-- ** Basic data types</span>
<a name="line-23"></a> <span class='hs-conid'>Bool</span><span class='hs-layout'>(</span><span class='hs-conid'>False</span><span class='hs-layout'>,</span> <span class='hs-conid'>True</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-24"></a> <span class='hs-layout'>(</span><span class='hs-varop'>&&</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>||</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>not</span><span class='hs-layout'>,</span> <span class='hs-varid'>otherwise</span><span class='hs-layout'>,</span>
<a name="line-25"></a>
<a name="line-26"></a> <span class='hs-conid'>Maybe</span><span class='hs-layout'>(</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span> <span class='hs-conid'>Just</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-27"></a> <span class='hs-varid'>maybe</span><span class='hs-layout'>,</span>
<a name="line-28"></a>
<a name="line-29"></a> <span class='hs-conid'>Either</span><span class='hs-layout'>(</span><span class='hs-conid'>Left</span><span class='hs-layout'>,</span> <span class='hs-conid'>Right</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-30"></a> <span class='hs-varid'>either</span><span class='hs-layout'>,</span>
<a name="line-31"></a>
<a name="line-32"></a> <span class='hs-conid'>Ordering</span><span class='hs-layout'>(</span><span class='hs-conid'>LT</span><span class='hs-layout'>,</span> <span class='hs-conid'>EQ</span><span class='hs-layout'>,</span> <span class='hs-conid'>GT</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-33"></a> <span class='hs-conid'>Char</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>,</span>
<a name="line-34"></a>
<a name="line-35"></a> <span class='hs-comment'>-- *** Tuples</span>
<a name="line-36"></a> <span class='hs-varid'>fst</span><span class='hs-layout'>,</span> <span class='hs-varid'>snd</span><span class='hs-layout'>,</span> <span class='hs-varid'>curry</span><span class='hs-layout'>,</span> <span class='hs-varid'>uncurry</span><span class='hs-layout'>,</span>
<a name="line-37"></a>
<a name="line-38"></a><span class='hs-cpp'>#if defined(__NHC__)</span>
<a name="line-39"></a> <span class='hs-conid'>[]</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- Not legal Haskell 98;</span>
<a name="line-40"></a> <span class='hs-comment'>-- ... available through built-in syntax</span>
<a name="line-41"></a> <span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Tuple</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- Includes tuple types</span>
<a name="line-42"></a> <span class='hs-conid'>()</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- Not legal Haskell 98</span>
<a name="line-43"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>-></span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- ... available through built-in syntax</span>
<a name="line-44"></a><span class='hs-cpp'>#endif</span>
<a name="line-45"></a><span class='hs-cpp'>#ifdef __HUGS__</span>
<a name="line-46"></a> <span class='hs-layout'>(</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- Not legal Haskell 98</span>
<a name="line-47"></a><span class='hs-cpp'>#endif</span>
<a name="line-48"></a>
<a name="line-49"></a> <span class='hs-comment'>-- ** Basic type classes</span>
<a name="line-50"></a> <span class='hs-conid'>Eq</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-51"></a> <span class='hs-conid'>Ord</span><span class='hs-layout'>(</span><span class='hs-varid'>compare</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'><</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'><=</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>>=</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>></span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>max</span><span class='hs-layout'>,</span> <span class='hs-varid'>min</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-52"></a> <span class='hs-conid'>Enum</span><span class='hs-layout'>(</span><span class='hs-varid'>succ</span><span class='hs-layout'>,</span> <span class='hs-varid'>pred</span><span class='hs-layout'>,</span> <span class='hs-varid'>toEnum</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromEnum</span><span class='hs-layout'>,</span> <span class='hs-varid'>enumFrom</span><span class='hs-layout'>,</span> <span class='hs-varid'>enumFromThen</span><span class='hs-layout'>,</span>
<a name="line-53"></a> <span class='hs-varid'>enumFromTo</span><span class='hs-layout'>,</span> <span class='hs-varid'>enumFromThenTo</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-54"></a> <span class='hs-conid'>Bounded</span><span class='hs-layout'>(</span><span class='hs-varid'>minBound</span><span class='hs-layout'>,</span> <span class='hs-varid'>maxBound</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-55"></a>
<a name="line-56"></a> <span class='hs-comment'>-- ** Numbers</span>
<a name="line-57"></a>
<a name="line-58"></a> <span class='hs-comment'>-- *** Numeric types</span>
<a name="line-59"></a> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Integer</span><span class='hs-layout'>,</span> <span class='hs-conid'>Float</span><span class='hs-layout'>,</span> <span class='hs-conid'>Double</span><span class='hs-layout'>,</span>
<a name="line-60"></a> <span class='hs-conid'>Rational</span><span class='hs-layout'>,</span>
<a name="line-61"></a>
<a name="line-62"></a> <span class='hs-comment'>-- *** Numeric type classes</span>
<a name="line-63"></a> <span class='hs-conid'>Num</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>+</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>*</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>negate</span><span class='hs-layout'>,</span> <span class='hs-varid'>abs</span><span class='hs-layout'>,</span> <span class='hs-varid'>signum</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromInteger</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-64"></a> <span class='hs-conid'>Real</span><span class='hs-layout'>(</span><span class='hs-varid'>toRational</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-65"></a> <span class='hs-conid'>Integral</span><span class='hs-layout'>(</span><span class='hs-varid'>quot</span><span class='hs-layout'>,</span> <span class='hs-varid'>rem</span><span class='hs-layout'>,</span> <span class='hs-varid'>div</span><span class='hs-layout'>,</span> <span class='hs-varid'>mod</span><span class='hs-layout'>,</span> <span class='hs-varid'>quotRem</span><span class='hs-layout'>,</span> <span class='hs-varid'>divMod</span><span class='hs-layout'>,</span> <span class='hs-varid'>toInteger</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-66"></a> <span class='hs-conid'>Fractional</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>/</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>recip</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromRational</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-67"></a> <span class='hs-conid'>Floating</span><span class='hs-layout'>(</span><span class='hs-varid'>pi</span><span class='hs-layout'>,</span> <span class='hs-varid'>exp</span><span class='hs-layout'>,</span> <span class='hs-varid'>log</span><span class='hs-layout'>,</span> <span class='hs-varid'>sqrt</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>**</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>logBase</span><span class='hs-layout'>,</span> <span class='hs-varid'>sin</span><span class='hs-layout'>,</span> <span class='hs-varid'>cos</span><span class='hs-layout'>,</span> <span class='hs-varid'>tan</span><span class='hs-layout'>,</span>
<a name="line-68"></a> <span class='hs-varid'>asin</span><span class='hs-layout'>,</span> <span class='hs-varid'>acos</span><span class='hs-layout'>,</span> <span class='hs-varid'>atan</span><span class='hs-layout'>,</span> <span class='hs-varid'>sinh</span><span class='hs-layout'>,</span> <span class='hs-varid'>cosh</span><span class='hs-layout'>,</span> <span class='hs-varid'>tanh</span><span class='hs-layout'>,</span> <span class='hs-varid'>asinh</span><span class='hs-layout'>,</span> <span class='hs-varid'>acosh</span><span class='hs-layout'>,</span> <span class='hs-varid'>atanh</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-69"></a> <span class='hs-conid'>RealFrac</span><span class='hs-layout'>(</span><span class='hs-varid'>properFraction</span><span class='hs-layout'>,</span> <span class='hs-varid'>truncate</span><span class='hs-layout'>,</span> <span class='hs-varid'>round</span><span class='hs-layout'>,</span> <span class='hs-varid'>ceiling</span><span class='hs-layout'>,</span> <span class='hs-varid'>floor</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-70"></a> <span class='hs-conid'>RealFloat</span><span class='hs-layout'>(</span><span class='hs-varid'>floatRadix</span><span class='hs-layout'>,</span> <span class='hs-varid'>floatDigits</span><span class='hs-layout'>,</span> <span class='hs-varid'>floatRange</span><span class='hs-layout'>,</span> <span class='hs-varid'>decodeFloat</span><span class='hs-layout'>,</span>
<a name="line-71"></a> <span class='hs-varid'>encodeFloat</span><span class='hs-layout'>,</span> <span class='hs-varid'>exponent</span><span class='hs-layout'>,</span> <span class='hs-varid'>significand</span><span class='hs-layout'>,</span> <span class='hs-varid'>scaleFloat</span><span class='hs-layout'>,</span> <span class='hs-varid'>isNaN</span><span class='hs-layout'>,</span>
<a name="line-72"></a> <span class='hs-varid'>isInfinite</span><span class='hs-layout'>,</span> <span class='hs-varid'>isDenormalized</span><span class='hs-layout'>,</span> <span class='hs-varid'>isIEEE</span><span class='hs-layout'>,</span> <span class='hs-varid'>isNegativeZero</span><span class='hs-layout'>,</span> <span class='hs-varid'>atan2</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-73"></a>
<a name="line-74"></a> <span class='hs-comment'>-- *** Numeric functions</span>
<a name="line-75"></a> <span class='hs-varid'>subtract</span><span class='hs-layout'>,</span> <span class='hs-varid'>even</span><span class='hs-layout'>,</span> <span class='hs-varid'>odd</span><span class='hs-layout'>,</span> <span class='hs-varid'>gcd</span><span class='hs-layout'>,</span> <span class='hs-varid'>lcm</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>^</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>^^</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-76"></a> <span class='hs-varid'>fromIntegral</span><span class='hs-layout'>,</span> <span class='hs-varid'>realToFrac</span><span class='hs-layout'>,</span>
<a name="line-77"></a>
<a name="line-78"></a> <span class='hs-comment'>-- ** Monads and functors</span>
<a name="line-79"></a> <span class='hs-conid'>Monad</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>>>=</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>>></span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>return</span><span class='hs-layout'>,</span> <span class='hs-varid'>fail</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-80"></a> <span class='hs-conid'>Functor</span><span class='hs-layout'>(</span><span class='hs-varid'>fmap</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-81"></a> <span class='hs-varid'>mapM</span><span class='hs-layout'>,</span> <span class='hs-varid'>mapM_</span><span class='hs-layout'>,</span> <span class='hs-varid'>sequence</span><span class='hs-layout'>,</span> <span class='hs-varid'>sequence_</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>=<<</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-82"></a>
<a name="line-83"></a> <span class='hs-comment'>-- ** Miscellaneous functions</span>
<a name="line-84"></a> <span class='hs-varid'>id</span><span class='hs-layout'>,</span> <span class='hs-varid'>const</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>.</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>flip</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>$</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>until</span><span class='hs-layout'>,</span>
<a name="line-85"></a> <span class='hs-varid'>asTypeOf</span><span class='hs-layout'>,</span> <span class='hs-varid'>error</span><span class='hs-layout'>,</span> <span class='hs-varid'>undefined</span><span class='hs-layout'>,</span>
<a name="line-86"></a> <span class='hs-varid'>seq</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>$!</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-87"></a>
<a name="line-88"></a> <span class='hs-comment'>-- * List operations</span>
<a name="line-89"></a> <span class='hs-varid'>map</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>filter</span><span class='hs-layout'>,</span>
<a name="line-90"></a> <span class='hs-varid'>head</span><span class='hs-layout'>,</span> <span class='hs-varid'>last</span><span class='hs-layout'>,</span> <span class='hs-varid'>tail</span><span class='hs-layout'>,</span> <span class='hs-varid'>init</span><span class='hs-layout'>,</span> <span class='hs-varid'>null</span><span class='hs-layout'>,</span> <span class='hs-varid'>length</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>!!</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-91"></a> <span class='hs-varid'>reverse</span><span class='hs-layout'>,</span>
<a name="line-92"></a> <span class='hs-comment'>-- ** Reducing lists (folds)</span>
<a name="line-93"></a> <span class='hs-varid'>foldl</span><span class='hs-layout'>,</span> <span class='hs-varid'>foldl1</span><span class='hs-layout'>,</span> <span class='hs-varid'>foldr</span><span class='hs-layout'>,</span> <span class='hs-varid'>foldr1</span><span class='hs-layout'>,</span>
<a name="line-94"></a> <span class='hs-comment'>-- *** Special folds</span>
<a name="line-95"></a> <span class='hs-varid'>and</span><span class='hs-layout'>,</span> <span class='hs-varid'>or</span><span class='hs-layout'>,</span> <span class='hs-varid'>any</span><span class='hs-layout'>,</span> <span class='hs-varid'>all</span><span class='hs-layout'>,</span>
<a name="line-96"></a> <span class='hs-varid'>sum</span><span class='hs-layout'>,</span> <span class='hs-varid'>product</span><span class='hs-layout'>,</span>
<a name="line-97"></a> <span class='hs-varid'>concat</span><span class='hs-layout'>,</span> <span class='hs-varid'>concatMap</span><span class='hs-layout'>,</span>
<a name="line-98"></a> <span class='hs-varid'>maximum</span><span class='hs-layout'>,</span> <span class='hs-varid'>minimum</span><span class='hs-layout'>,</span>
<a name="line-99"></a> <span class='hs-comment'>-- ** Building lists</span>
<a name="line-100"></a> <span class='hs-comment'>-- *** Scans</span>
<a name="line-101"></a> <span class='hs-varid'>scanl</span><span class='hs-layout'>,</span> <span class='hs-varid'>scanl1</span><span class='hs-layout'>,</span> <span class='hs-varid'>scanr</span><span class='hs-layout'>,</span> <span class='hs-varid'>scanr1</span><span class='hs-layout'>,</span>
<a name="line-102"></a> <span class='hs-comment'>-- *** Infinite lists</span>
<a name="line-103"></a> <span class='hs-varid'>iterate</span><span class='hs-layout'>,</span> <span class='hs-varid'>repeat</span><span class='hs-layout'>,</span> <span class='hs-varid'>replicate</span><span class='hs-layout'>,</span> <span class='hs-varid'>cycle</span><span class='hs-layout'>,</span>
<a name="line-104"></a> <span class='hs-comment'>-- ** Sublists</span>
<a name="line-105"></a> <span class='hs-varid'>take</span><span class='hs-layout'>,</span> <span class='hs-varid'>drop</span><span class='hs-layout'>,</span> <span class='hs-varid'>splitAt</span><span class='hs-layout'>,</span> <span class='hs-varid'>takeWhile</span><span class='hs-layout'>,</span> <span class='hs-varid'>dropWhile</span><span class='hs-layout'>,</span> <span class='hs-varid'>span</span><span class='hs-layout'>,</span> <span class='hs-varid'>break</span><span class='hs-layout'>,</span>
<a name="line-106"></a> <span class='hs-comment'>-- ** Searching lists</span>
<a name="line-107"></a> <span class='hs-varid'>elem</span><span class='hs-layout'>,</span> <span class='hs-varid'>notElem</span><span class='hs-layout'>,</span> <span class='hs-varid'>lookup</span><span class='hs-layout'>,</span>
<a name="line-108"></a> <span class='hs-comment'>-- ** Zipping and unzipping lists</span>
<a name="line-109"></a> <span class='hs-varid'>zip</span><span class='hs-layout'>,</span> <span class='hs-varid'>zip3</span><span class='hs-layout'>,</span> <span class='hs-varid'>zipWith</span><span class='hs-layout'>,</span> <span class='hs-varid'>zipWith3</span><span class='hs-layout'>,</span> <span class='hs-varid'>unzip</span><span class='hs-layout'>,</span> <span class='hs-varid'>unzip3</span><span class='hs-layout'>,</span>
<a name="line-110"></a> <span class='hs-comment'>-- ** Functions on strings</span>
<a name="line-111"></a> <span class='hs-varid'>lines</span><span class='hs-layout'>,</span> <span class='hs-varid'>words</span><span class='hs-layout'>,</span> <span class='hs-varid'>unlines</span><span class='hs-layout'>,</span> <span class='hs-varid'>unwords</span><span class='hs-layout'>,</span>
<a name="line-112"></a>
<a name="line-113"></a> <span class='hs-comment'>-- * Converting to and from @String@</span>
<a name="line-114"></a> <span class='hs-comment'>-- ** Converting to @String@</span>
<a name="line-115"></a> <span class='hs-conid'>ShowS</span><span class='hs-layout'>,</span>
<a name="line-116"></a> <span class='hs-conid'>Show</span><span class='hs-layout'>(</span><span class='hs-varid'>showsPrec</span><span class='hs-layout'>,</span> <span class='hs-varid'>showList</span><span class='hs-layout'>,</span> <span class='hs-varid'>show</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-117"></a> <span class='hs-varid'>shows</span><span class='hs-layout'>,</span>
<a name="line-118"></a> <span class='hs-varid'>showChar</span><span class='hs-layout'>,</span> <span class='hs-varid'>showString</span><span class='hs-layout'>,</span> <span class='hs-varid'>showParen</span><span class='hs-layout'>,</span>
<a name="line-119"></a> <span class='hs-comment'>-- ** Converting from @String@</span>
<a name="line-120"></a> <span class='hs-conid'>ReadS</span><span class='hs-layout'>,</span>
<a name="line-121"></a> <span class='hs-conid'>Read</span><span class='hs-layout'>(</span><span class='hs-varid'>readsPrec</span><span class='hs-layout'>,</span> <span class='hs-varid'>readList</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-122"></a> <span class='hs-varid'>reads</span><span class='hs-layout'>,</span> <span class='hs-varid'>readParen</span><span class='hs-layout'>,</span> <span class='hs-varid'>read</span><span class='hs-layout'>,</span> <span class='hs-varid'>lex</span><span class='hs-layout'>,</span>
<a name="line-123"></a>
<a name="line-124"></a> <span class='hs-comment'>-- * Basic Input and output</span>
<a name="line-125"></a> <span class='hs-conid'>IO</span><span class='hs-layout'>,</span>
<a name="line-126"></a> <span class='hs-comment'>-- ** Simple I\/O operations</span>
<a name="line-127"></a> <span class='hs-comment'>-- All I/O functions defined here are character oriented. The</span>
<a name="line-128"></a> <span class='hs-comment'>-- treatment of the newline character will vary on different systems.</span>
<a name="line-129"></a> <span class='hs-comment'>-- For example, two characters of input, return and linefeed, may</span>
<a name="line-130"></a> <span class='hs-comment'>-- read as a single newline character. These functions cannot be</span>
<a name="line-131"></a> <span class='hs-comment'>-- used portably for binary I/O.</span>
<a name="line-132"></a> <span class='hs-comment'>-- *** Output functions</span>
<a name="line-133"></a> <span class='hs-varid'>putChar</span><span class='hs-layout'>,</span>
<a name="line-134"></a> <span class='hs-varid'>putStr</span><span class='hs-layout'>,</span> <span class='hs-varid'>putStrLn</span><span class='hs-layout'>,</span> <span class='hs-varid'>print</span><span class='hs-layout'>,</span>
<a name="line-135"></a> <span class='hs-comment'>-- *** Input functions</span>
<a name="line-136"></a> <span class='hs-varid'>getChar</span><span class='hs-layout'>,</span>
<a name="line-137"></a> <span class='hs-varid'>getLine</span><span class='hs-layout'>,</span> <span class='hs-varid'>getContents</span><span class='hs-layout'>,</span> <span class='hs-varid'>interact</span><span class='hs-layout'>,</span>
<a name="line-138"></a> <span class='hs-comment'>-- *** Files</span>
<a name="line-139"></a> <span class='hs-conid'>FilePath</span><span class='hs-layout'>,</span>
<a name="line-140"></a> <span class='hs-varid'>readFile</span><span class='hs-layout'>,</span> <span class='hs-varid'>writeFile</span><span class='hs-layout'>,</span> <span class='hs-varid'>appendFile</span><span class='hs-layout'>,</span> <span class='hs-varid'>readIO</span><span class='hs-layout'>,</span> <span class='hs-varid'>readLn</span><span class='hs-layout'>,</span>
<a name="line-141"></a> <span class='hs-comment'>-- ** Exception handling in the I\/O monad</span>
<a name="line-142"></a> <span class='hs-conid'>IOError</span><span class='hs-layout'>,</span> <span class='hs-varid'>ioError</span><span class='hs-layout'>,</span> <span class='hs-varid'>userError</span><span class='hs-layout'>,</span> <span class='hs-varid'>catch</span>
<a name="line-143"></a>
<a name="line-144"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-145"></a>
<a name="line-146"></a><span class='hs-cpp'>#ifndef __HUGS__</span>
<a name="line-147"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-148"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span>
<a name="line-149"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span>
<a name="line-150"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span>
<a name="line-151"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Either</span>
<a name="line-152"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span>
<a name="line-153"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Tuple</span>
<a name="line-154"></a><span class='hs-cpp'>#endif</span>
<a name="line-155"></a>
<a name="line-156"></a><span class='hs-cpp'>#ifdef __GLASGOW_HASKELL__</span>
<a name="line-157"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Base</span>
<a name="line-158"></a><span class='hs-comment'>-- import GHC.IO</span>
<a name="line-159"></a><span class='hs-comment'>-- import GHC.IO.Exception</span>
<a name="line-160"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Read</span>
<a name="line-161"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Enum</span>
<a name="line-162"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Num</span>
<a name="line-163"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Real</span>
<a name="line-164"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Float</span>
<a name="line-165"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Show</span>
<a name="line-166"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Err</span> <span class='hs-layout'>(</span> <span class='hs-varid'>undefined</span> <span class='hs-layout'>)</span>
<a name="line-167"></a><span class='hs-cpp'>#endif</span>
<a name="line-168"></a>
<a name="line-169"></a><span class='hs-cpp'>#ifdef __HUGS__</span>
<a name="line-170"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Hugs</span><span class='hs-varop'>.</span><span class='hs-conid'>Prelude</span>
<a name="line-171"></a><span class='hs-cpp'>#endif</span>
<a name="line-172"></a>
<a name="line-173"></a><span class='hs-cpp'>#ifndef __HUGS__</span>
<a name="line-174"></a><span class='hs-keyword'>infixr</span> <span class='hs-num'>0</span> <span class='hs-varop'>$!</span>
<a name="line-175"></a><span class='hs-cpp'>#endif</span>
<a name="line-176"></a>
<a name="line-177"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-178"></a><span class='hs-comment'>-- Miscellaneous functions</span>
<a name="line-179"></a>
<a name="line-180"></a><a name="$!"></a><span class='hs-comment'>-- | Strict (call-by-value) application, defined in terms of 'seq'.</span>
<a name="line-181"></a><span class='hs-layout'>(</span><span class='hs-varop'>$!</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-182"></a><span class='hs-cpp'>#ifdef __GLASGOW_HASKELL__</span>
<a name="line-183"></a><a name="f"></a><span class='hs-definition'>f</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>vx</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>in</span> <span class='hs-varid'>f</span> <span class='hs-varid'>vx</span> <span class='hs-comment'>-- see #2273</span>
<a name="line-184"></a><span class='hs-cpp'>#elif !defined(__HUGS__)</span>
<a name="line-185"></a><span class='hs-definition'>f</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>`seq`</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span>
<a name="line-186"></a><span class='hs-cpp'>#endif</span>
<a name="line-187"></a>
<a name="line-188"></a><span class='hs-cpp'>#ifdef __HADDOCK__</span>
<a name="line-189"></a><a name="seq"></a><span class='hs-comment'>-- | The value of @'seq' a b@ is bottom if @a@ is bottom, and otherwise</span>
<a name="line-190"></a><span class='hs-comment'>-- equal to @b@. 'seq' is usually introduced to improve performance by</span>
<a name="line-191"></a><span class='hs-comment'>-- avoiding unneeded laziness.</span>
<a name="line-192"></a><span class='hs-definition'>seq</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-193"></a><span class='hs-definition'>seq</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>y</span>
<a name="line-194"></a><span class='hs-cpp'>#endif</span>
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