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<pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : Control.Monad.Writer.Lazy</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Andy Gill 2001,</span>
<a name="line-5"></a><span class='hs-comment'>-- (c) Oregon Graduate Institute of Science and Technology, 2001</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD-style (see the file 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 : experimental</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : non-portable (multi-param classes, functional dependencies)</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- Lazy writer monads.</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-- Inspired by the paper</span>
<a name="line-15"></a><span class='hs-comment'>-- /Functional Programming with Overloading and Higher-Order Polymorphism/,</span>
<a name="line-16"></a><span class='hs-comment'>-- Mark P Jones (<<a href="http://web.cecs.pdx.edu/~mpj/pubs/springschool.html">http://web.cecs.pdx.edu/~mpj/pubs/springschool.html</a>>)</span>
<a name="line-17"></a><span class='hs-comment'>-- Advanced School of Functional Programming, 1995.</span>
<a name="line-18"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-19"></a>
<a name="line-20"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Writer</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-layout'>(</span>
<a name="line-21"></a> <span class='hs-comment'>-- * MonadWriter class</span>
<a name="line-22"></a> <span class='hs-conid'>MonadWriter</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-23"></a> <span class='hs-varid'>listens</span><span class='hs-layout'>,</span>
<a name="line-24"></a> <span class='hs-varid'>censor</span><span class='hs-layout'>,</span>
<a name="line-25"></a> <span class='hs-comment'>-- * The Writer monad</span>
<a name="line-26"></a> <span class='hs-conid'>Writer</span><span class='hs-layout'>,</span>
<a name="line-27"></a> <span class='hs-varid'>runWriter</span><span class='hs-layout'>,</span>
<a name="line-28"></a> <span class='hs-varid'>execWriter</span><span class='hs-layout'>,</span>
<a name="line-29"></a> <span class='hs-varid'>mapWriter</span><span class='hs-layout'>,</span>
<a name="line-30"></a> <span class='hs-comment'>-- * The WriterT monad transformer</span>
<a name="line-31"></a> <span class='hs-conid'>WriterT</span><span class='hs-layout'>(</span><span class='hs-conid'>WriterT</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-32"></a> <span class='hs-varid'>runWriterT</span><span class='hs-layout'>,</span>
<a name="line-33"></a> <span class='hs-varid'>execWriterT</span><span class='hs-layout'>,</span>
<a name="line-34"></a> <span class='hs-varid'>mapWriterT</span><span class='hs-layout'>,</span>
<a name="line-35"></a> <span class='hs-keyword'>module</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-layout'>,</span>
<a name="line-36"></a> <span class='hs-keyword'>module</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Fix</span><span class='hs-layout'>,</span>
<a name="line-37"></a> <span class='hs-keyword'>module</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-layout'>,</span>
<a name="line-38"></a> <span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span><span class='hs-layout'>,</span>
<a name="line-39"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-40"></a>
<a name="line-41"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Writer</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span>
<a name="line-42"></a>
<a name="line-43"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span>
<a name="line-44"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Writer</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-layout'>(</span>
<a name="line-45"></a> <span class='hs-conid'>Writer</span><span class='hs-layout'>,</span> <span class='hs-varid'>runWriter</span><span class='hs-layout'>,</span> <span class='hs-varid'>execWriter</span><span class='hs-layout'>,</span> <span class='hs-varid'>mapWriter</span><span class='hs-layout'>,</span>
<a name="line-46"></a> <span class='hs-conid'>WriterT</span><span class='hs-layout'>(</span><span class='hs-conid'>WriterT</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>runWriterT</span><span class='hs-layout'>,</span> <span class='hs-varid'>execWriterT</span><span class='hs-layout'>,</span> <span class='hs-varid'>mapWriterT</span><span class='hs-layout'>)</span>
<a name="line-47"></a>
<a name="line-48"></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-49"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Fix</span>
<a name="line-50"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span>
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