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  51.               <td class="nav-title n3"><a href="parser-overview.html">Parser overview</a></td>
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  59.               <td class="nav-title n3"><a href="charparsers.html">FParsec.CharParsers</a></td>
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  65.               <td class="nav-title n3"><a href="operatorprecedenceparser.html">FParsec.OperatorPrecedenceParser</a></td>
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  98.               <td class="nav-title n3"><a href="position.html">FParsec.Position</a></td>
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  102.               <td class="nav-title n3"><a href="charstream.html">FParsec.CharStream</a></td>
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  109.        </table>
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    119. 

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    120. 

  120.  <div id="main-content"> 
    121. 

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    122. 

  122.   <span class="breadcrumbs">
    123. 

  123.    <span id="breadcrumbs-parents"><a href="../index.html">FParsec Documentation</a><span class="breadcrumbs-sep"> > </span><a href="index.html">Reference</a></span><span class="breadcrumbs-sep"> > </span>FParsec.Error
    124. 

  124.   </span>
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  125.  </div>  
    126. 

  126.  <div class="section s2">
    127. 

  127.   <h1 class="title h2"><span class="section-number">2.5</span> FParsec.Error</h1>
    128. 

  128.   <div id="interface" class="section s3">
    129. 

  129.    <h2 class="title h3"><span class="section-number">2.5.1</span> Interface</h2>
    130. 

  130.    <div class="intro i3">
    131. 

  131.     <div class="para _1">
    132. 

  132. <pre class="code fsharp"><span class="ck">module</span> <span class="ci">FParsec</span><span class="cm">.</span><span class="ci">Error</span>
    133. 

  133. 

  134. <span class="ck">type</span> <a id="interface.ErrorMessage:B:" href="#members.ErrorMessage"><span class="interface-member-marker"><span class="ci">ErrorMessage</span></span></a> <span class="co">=</span>
    135. 

  135.      <span class="cp">|</span> <a id="interface.Expected:B:" href="#members.Expected"><span class="interface-member-marker"><span class="ci">Expected</span></span></a>           <span class="ck">of</span> <span class="ci">string</span>
    136. 

  136.      <span class="cp">|</span> <a id="interface.ExpectedString:B:" href="#members.ExpectedString"><span class="interface-member-marker"><span class="ci">ExpectedString</span></span></a>     <span class="ck">of</span> <span class="ci">string</span>
    137. 

  137.      <span class="cp">|</span> <a id="interface.ExpectedStringCI:B:" href="#members.ExpectedStringCI"><span class="interface-member-marker"><span class="ci">ExpectedStringCI</span></span></a>   <span class="ck">of</span> <span class="ci">string</span>
    138. 

  138.      <span class="cp">|</span> <a id="interface.Unexpected:B:" href="#members.Unexpected"><span class="interface-member-marker"><span class="ci">Unexpected</span></span></a>         <span class="ck">of</span> <span class="ci">string</span>
    139. 

  139.      <span class="cp">|</span> <a id="interface.UnexpectedString:B:" href="#members.UnexpectedString"><span class="interface-member-marker"><span class="ci">UnexpectedString</span></span></a>   <span class="ck">of</span> <span class="ci">string</span>
    140. 

  140.      <span class="cp">|</span> <a id="interface.UnexpectedStringCI:B:" href="#members.UnexpectedStringCI"><span class="interface-member-marker"><span class="ci">UnexpectedStringCI</span></span></a> <span class="ck">of</span> <span class="ci">string</span>
    141. 

  141.      <span class="cp">|</span> <a id="interface.Message:B:" href="#members.Message"><span class="interface-member-marker"><span class="ci">Message</span></span></a>            <span class="ck">of</span> <span class="ci">string</span>
    142. 

  142.      <span class="cp">|</span> <a id="interface.CompoundError:B:" href="#members.CompoundError"><span class="interface-member-marker"><span class="ci">CompoundError</span></span></a>      <span class="ck">of</span> <span class="ci">string</span> <span class="cp">*</span> <a href="position.html"><span class="ci">Position</span></a> <span class="cp">*</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    143. 

  143.      <span class="cp">|</span> <a id="interface.BacktrackPoint:B:" href="#members.BacktrackPoint"><span class="interface-member-marker"><span class="ci">BacktrackPoint</span></span></a>     <span class="ck">of</span> <a href="position.html"><span class="ci">Position</span></a> <span class="cp">*</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    144. 

  144.      <span class="cp">|</span> <a id="interface.OtherError:B:" href="#members.OtherError"><span class="interface-member-marker"><span class="ci">OtherError</span></span></a>         <span class="ck">of</span> <a href="http://msdn.microsoft.com/en-us/library/system.icomparable.aspx"><span class="ci">System</span><span class="cm">.</span><span class="ci">IComparable</span></a>
    145. 

  145. 

  146. <span class="cp">[&lt;</span><span class="ci">CompilationRepresentation</span><span class="cp">(</span><span class="ci">CompilationRepresentationFlags</span><span class="cm">.</span><span class="ci">UseNullAsTrueValue</span><span class="cp">)</span><span class="cp">;</span>
    147. 

  147.   <span class="ci">CustomEquality</span><span class="cp">;</span> <span class="ci">CustomComparison</span><span class="cp">&gt;]</span>
    148. 

  148. <span class="ck">type</span> <a id="interface.ErrorMessageList:B:" href="#members.ErrorMessageList"><span class="interface-member-marker"><span class="ci">ErrorMessageList</span></span></a> <span class="co">=</span>
    149. 

  149.     <span class="cp">|</span> <a id="interface.AddErrorMessage:B:" href="#members.AddErrorMessage"><span class="interface-member-marker"><span class="ci">AddErrorMessage</span></span></a> <span class="ck">of</span> <a href="#members.ErrorMessage"><span class="ci">ErrorMessage</span></a> <span class="cp">*</span> <span class="ci">ErrorMessageList</span>
    150. 

  150.     <span class="cp">|</span> <a id="interface.NoErrorMessages:B:" href="#members.NoErrorMessages"><span class="interface-member-marker"><span class="ci">NoErrorMessages</span></span></a>
    151. 

  151.     <span class="ck">with</span>
    152. 

  152.          <span class="ck">member</span> <a id="interface.ToSet:B:" href="#members.ToSet"><span class="interface-member-marker"><span class="ci">ToSet</span></span></a><span class="cp">:</span> <span class="ci">unit</span> <span class="cr">-&gt;</span> <span class="ci">Set</span><span class="cp">&lt;</span><a href="#members.ErrorMessage"><span class="ci">ErrorMessage</span></a><span class="cp">&gt;</span>
    153. 

  153.          <span class="ck">static</span> <span class="ck">member</span> <a id="interface.OfSeq:B:" href="#members.OfSeq"><span class="interface-member-marker"><span class="ci">OfSeq</span></span></a><span class="cp">:</span> <span class="ci">seq</span><span class="cp">&lt;</span><a href="#members.ErrorMessage"><span class="ci">ErrorMessage</span></a><span class="cp">&gt;</span> <span class="cr">-&gt;</span> <span class="ci">ErrorMessageList</span>
    154. 

  154. 

  155.          <span class="ck">override</span> <span class="ci">Equals</span><span class="cp">:</span> <span class="ci">obj</span> <span class="cr">-&gt;</span> <span class="ci">bool</span>
    156. 

  156.          <span class="ck">override</span> <span class="ci">GetHashCode</span><span class="cp">:</span> <span class="ci">unit</span> <span class="cr">-&gt;</span> <span class="ci">int</span>
    157. 

  157.          <span class="ck">interface</span> <a href="http://msdn.microsoft.com/en-us/library/system.icomparable.aspx"><span class="ci">System</span><span class="cm">.</span><span class="ci">IComparable</span></a>
    158. 

  158. 

  159. <span class="ck">val</span> <a id="interface.expectedError:B:" href="#members.expectedError"><span class="interface-member-marker"><span class="ci">expectedError</span></span></a><span class="cp">:</span>           <span class="ci">string</span> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    160. 

  160. <span class="ck">val</span> <a id="interface.expectedStringError:B:" href="#members.expectedStringError"><span class="interface-member-marker"><span class="ci">expectedStringError</span></span></a><span class="cp">:</span>     <span class="ci">string</span> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    161. 

  161. <span class="ck">val</span> <a id="interface.expectedStringCIError:B:" href="#members.expectedStringCIError"><span class="interface-member-marker"><span class="ci">expectedStringCIError</span></span></a><span class="cp">:</span>   <span class="ci">string</span> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    162. 

  162. <span class="ck">val</span> <a id="interface.unexpectedError:B:" href="#members.unexpectedError"><span class="interface-member-marker"><span class="ci">unexpectedError</span></span></a><span class="cp">:</span>         <span class="ci">string</span> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    163. 

  163. <span class="ck">val</span> <a id="interface.unexpectedStringError:B:" href="#members.unexpectedStringError"><span class="interface-member-marker"><span class="ci">unexpectedStringError</span></span></a><span class="cp">:</span>   <span class="ci">string</span> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    164. 

  164. <span class="ck">val</span> <a id="interface.unexpectedStringCIError:B:" href="#members.unexpectedStringCIError"><span class="interface-member-marker"><span class="ci">unexpectedStringCIError</span></span></a><span class="cp">:</span> <span class="ci">string</span> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    165. 

  165. <span class="ck">val</span> <a id="interface.messageError:B:" href="#members.messageError"><span class="interface-member-marker"><span class="ci">messageError</span></span></a><span class="cp">:</span>            <span class="ci">string</span> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    166. 

  166. <span class="ck">val</span> <a id="interface.otherError:B:" href="#members.otherError"><span class="interface-member-marker"><span class="ci">otherError</span></span></a><span class="cp">:</span>              <span class="ci">obj</span>    <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    167. 

  167. 

  168. <span class="ck">val</span> <a id="interface.compoundError:B:" href="#members.compoundError"><span class="interface-member-marker"><span class="ci">compoundError</span></span></a><span class="cp">:</span>   <span class="ci">string</span> <span class="cr">-&gt;</span> <a href="state.html"><span class="ci">State</span></a><span class="cp">&lt;</span><span class="ctv">'u</span><span class="cp">&gt;</span> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    169. 

  169. <span class="ck">val</span> <a id="interface.backtrackError:B:" href="#members.backtrackError"><span class="interface-member-marker"><span class="ci">backtrackError</span></span></a><span class="cp">:</span>            <a href="state.html"><span class="ci">State</span></a><span class="cp">&lt;</span><span class="ctv">'u</span><span class="cp">&gt;</span> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    170. 

    171. 

  171. <span class="ck">val</span> <a id="interface.concatErrorMessages:B:" href="#members.concatErrorMessages"><span class="interface-member-marker"><span class="ci">concatErrorMessages</span></span></a><span class="cp">:</span>
    172. 

  172.         <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    173. 

  173. 

  174. <span class="ck">val</span> <span class="ck">inline</span> <a id="interface.mergeErrors:B:" href="#members.mergeErrors"><span class="interface-member-marker"><span class="ci">mergeErrors</span></span></a><span class="cp">:</span>
    175. 

  175.         <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a> <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    176. 

  176. 

  177. <span class="ck">val</span> <a id="interface.mergeErrorsIfNeeded:B:" href="#members.mergeErrorsIfNeeded"><span class="interface-member-marker"><span class="ci">mergeErrorsIfNeeded</span></span></a><span class="cp">:</span>
    178. 

  178.         <span class="ci">oldState</span><span class="cp">:</span> <a href="state.html"><span class="ci">State</span></a><span class="cp">&lt;</span><span class="ctv">'u</span><span class="cp">&gt;</span> <span class="cr">-&gt;</span> <span class="ci">oldError</span><span class="cp">:</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    179. 

  179.      <span class="cr">-&gt;</span> <span class="ci">newState</span><span class="cp">:</span> <a href="state.html"><span class="ci">State</span></a><span class="cp">&lt;</span><span class="ctv">'u</span><span class="cp">&gt;</span> <span class="cr">-&gt;</span> <span class="ci">newError</span><span class="cp">:</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    180. 

  180.      <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    181. 

  181. 

  182. <span class="ck">val</span> <a id="interface.mergeErrorsIfNeeded3:B:" href="#members.mergeErrorsIfNeeded3"><span class="interface-member-marker"><span class="ci">mergeErrorsIfNeeded3</span></span></a><span class="cp">:</span>
    183. 

  183.         <span class="ci">oldestState</span><span class="cp">:</span> <a href="state.html"><span class="ci">State</span></a><span class="cp">&lt;</span><span class="ctv">'u</span><span class="cp">&gt;</span> <span class="cr">-&gt;</span> <span class="ci">oldestError</span><span class="cp">:</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    184. 

  184.      <span class="cr">-&gt;</span> <span class="ci">oldState</span><span class="cp">:</span>    <a href="state.html"><span class="ci">State</span></a><span class="cp">&lt;</span><span class="ctv">'u</span><span class="cp">&gt;</span> <span class="cr">-&gt;</span> <span class="ci">oldError</span><span class="cp">:</span>    <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    185. 

  185.      <span class="cr">-&gt;</span> <span class="ci">newState</span><span class="cp">:</span>    <a href="state.html"><span class="ci">State</span></a><span class="cp">&lt;</span><span class="ctv">'u</span><span class="cp">&gt;</span> <span class="cr">-&gt;</span> <span class="ci">newError</span><span class="cp">:</span>    <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    186. 

  186.      <span class="cr">-&gt;</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    187. 

  187. 

  188. <span class="cp">[&lt;</span><span class="ci">Sealed</span><span class="cp">&gt;]</span>
    189. 

  189. <span class="ck">type</span> <a id="interface.ParserError:B:" href="#members.ParserError"><span class="interface-member-marker"><span class="ci">ParserError</span></span></a> <span class="co">=</span>
    190. 

  190.   <a id="interface.new:B:" href="#members.new"><span class="interface-member-marker"><span class="ck">new</span></span></a><span class="cp">:</span> <a href="position.html"><span class="ci">Position</span></a> <span class="cp">*</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a> <span class="cr">-&gt;</span> <span class="ci">ParserError</span>
    191. 

  191. 

  192.   <span class="ck">member</span> <a id="interface.Position:B:" href="#members.Position"><span class="interface-member-marker"><span class="ci">Position</span></span></a><span class="cp">:</span> <a href="position.html"><span class="ci">Position</span></a>
    193. 

  193.   <span class="ck">member</span> <a id="interface.member-ErrorMessageList:B:" href="#members.member-ErrorMessageList"><span class="interface-member-marker"><span class="ci">ErrorMessageList</span></span></a><span class="cp">:</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    194. 

  194. <a id="interface.ToString:47:WriteTo"></a>
    195. 

  195.   <span class="ck">override</span> <a id="interface.ToString:B:" href="#members.ToString"><span class="interface-member-marker"><span class="ci">ToString</span></span></a><span class="cp">:</span> <span class="ci">unit</span> <span class="cr">-&gt;</span> <span class="ci">string</span>
    196. 

  196.   <span class="ck">member</span> <a id="interface.ToString_CharStream:B:" href="#members.ToString_CharStream"><span class="interface-member-marker"><span class="ci">ToString</span></span></a><span class="cp">:</span> <span class="ci">streamWhereErrorOccurred</span><span class="cp">:</span> <a href="charstream.html"><span class="ci">CharStream</span></a> <span class="cr">-&gt;</span> <span class="ci">string</span>
    197. 

  197. 

  198.   <span class="ck">member</span> <a id="interface.WriteTo_stream:B:" href="#members.WriteTo_stream"><span class="interface-member-marker"><span class="ci">WriteTo</span></span></a><span class="cp">:</span>
    199. 

  199.            <span class="ci">textWriter</span><span class="cp">:</span> <a href="http://msdn.microsoft.com/en-us/library/system.io.textwriter.aspx"><span class="ci">System</span><span class="cm">.</span><span class="ci">IO</span><span class="cm">.</span><span class="ci">TextWriter</span></a>
    200. 

  200.          <span class="cp">*</span> <span class="ci">streamWhereErrorOccurred</span><span class="cp">:</span> <a href="charstream.html"><span class="ci">CharStream</span></a>
    201. 

  201.          <span class="cp">*</span> <span class="cp">?</span><span class="ci">columnWidth</span><span class="cp">:</span> <span class="ci">int</span>
    202. 

  202.          <span class="cp">*</span> <span class="cp">?</span><span class="ci">initialIndentation</span><span class="cp">:</span> <span class="ci">string</span> <span class="cp">*</span> <span class="cp">?</span><span class="ci">indentationIncrement</span><span class="cp">:</span> <span class="ci">string</span>
    203. 

  203.          <span class="cr">-&gt;</span> <span class="ci">unit</span>
    204. 

  204. 

  205.   <span class="ck">member</span> <a id="interface.WriteTo_getStreamByName:B:" href="#members.WriteTo_getStreamByName"><span class="interface-member-marker"><span class="ci">WriteTo</span></span></a><span class="cp">:</span>
    206. 

  206.            <span class="ci">textWriter</span><span class="cp">:</span> <a href="http://msdn.microsoft.com/en-us/library/system.io.textwriter.aspx"><span class="ci">System</span><span class="cm">.</span><span class="ci">IO</span><span class="cm">.</span><span class="ci">TextWriter</span></a>
    207. 

  207.          <span class="cp">*</span> <span class="ci">getStreamByName</span><span class="cp">:</span> <span class="cp">(</span><span class="ci">string</span> <span class="cr">-&gt;</span> <a href="charstream.html"><span class="ci">CharStream</span></a><span class="cp">)</span>
    208. 

  208.          <span class="cp">*</span> <span class="cp">?</span><span class="ci">columnWidth</span><span class="cp">:</span> <span class="ci">int</span>
    209. 

  209.          <span class="cp">*</span> <span class="cp">?</span><span class="ci">initialIndentation</span><span class="cp">:</span> <span class="ci">string</span> <span class="cp">*</span> <span class="cp">?</span><span class="ci">indentationIncrement</span><span class="cp">:</span> <span class="ci">string</span>
    210. 

  210.          <span class="cr">-&gt;</span> <span class="ci">unit</span>
    211. 

  211. 

  212.   <span class="ck">member</span> <a id="interface.WriteTo:B:" href="#members.WriteTo"><span class="interface-member-marker"><span class="ci">WriteTo</span></span></a><span class="cp">:</span>
    213. 

  213.            <span class="ci">textWriter</span><span class="cp">:</span> <a href="http://msdn.microsoft.com/en-us/library/system.io.textwriter.aspx"><span class="ci">System</span><span class="cm">.</span><span class="ci">IO</span><span class="cm">.</span><span class="ci">TextWriter</span></a>
    214. 

  214.          <span class="cp">*</span> <span class="cp">?</span><span class="ci">positionPrinter</span><span class="cp">:</span>
    215. 

  215.              <span class="cp">(</span><a href="http://msdn.microsoft.com/en-us/library/system.io.textwriter.aspx"><span class="ci">System</span><span class="cm">.</span><span class="ci">IO</span><span class="cm">.</span><span class="ci">TextWriter</span></a> <span class="cr">-&gt;</span> <a href="position.html"><span class="ci">Position</span></a> <span class="cr">-&gt;</span> <span class="ci">string</span> <span class="cr">-&gt;</span> <span class="ci">int</span> <span class="cr">-&gt;</span> <span class="ci">unit</span><span class="cp">)</span>
    216. 

  216.          <span class="cp">*</span> <span class="cp">?</span><span class="ci">columnWidth</span><span class="cp">:</span> <span class="ci">int</span>
    217. 

  217.          <span class="cp">*</span> <span class="cp">?</span><span class="ci">initialIndentation</span><span class="cp">:</span> <span class="ci">string</span> <span class="cp">*</span> <span class="cp">?</span><span class="ci">indentationIncrement</span><span class="cp">:</span> <span class="ci">string</span>
    218. 

  218.          <span class="cr">-&gt;</span> <span class="ci">unit</span>
    219. 

  219. 

  220.   <span class="ck">override</span> <span class="ci">Equals</span><span class="cp">:</span> <span class="ci">obj</span> <span class="cr">-&gt;</span> <span class="ci">bool</span>
    221. 

  221.   <span class="ck">override</span> <span class="ci">GetHashCode</span><span class="cp">:</span> <span class="ci">unit</span> <span class="cr">-&gt;</span> <span class="ci">int</span>
    222. 

  222.   <span class="ck">interface</span> <a href="http://msdn.microsoft.com/en-us/library/system.icomparable.aspx"><span class="ci">System</span><span class="cm">.</span><span class="ci">IComparable</span></a>
    223. 

  223. </pre>
    224. 

  224.     </div>
    225. 

  225.    </div>
    226. 

  226.   </div>
    227. 

  227.   <div id="members" class="section s3">
    228. 

  228.    <h2 class="title h3"><span class="section-number">2.5.2</span> Members</h2>
    229. 

  229.    <div class="intro i3">
    230. 

  230.     <div class="para _1">
    231. 

  231.      <div class="interface-members">
    232. 

  232.       <div class="interface-member _1" id="members.ErrorMessage">
    233. 

  233.        <div class="interface-member-code">
    234. 

  234.         <a class="interface-member-backlink" href="#interface.ErrorMessage:B:">⇧</a>
    235. 

  235. <pre class="code fsharp"><span class="ck">type</span> <span class="interface-member-marker"><span class="ci">ErrorMessage</span></span></pre>
    236. 

  236.        </div>
    237. 

  237.        <div class="interface-member-description">
    238. 

  238.         <p class="para _1">
    239. 

  239.          This union type represents an individual error message within the <code class="fsharp"><a href="#members.ErrorMessageList"><span
    240. 

  240.          class="ci">ErrorMessageList</span></a></code> returned by a <code class="fsharp"><a href="primitives.html#members.Parser"><span
    241. 

  241.          class="ci">Parser</span></a></code> function.
    242. 

  242.         </p>
    243. 

  243.         <p class="para _2">
    244. 

  244.          <code class="fsharp"><span class="ci">ErrorMessage</span></code> values are always associated with a particular input stream position. For
    245. 

  245.          example, the error messages of the <code class="fsharp"><a href="#members.ErrorMessageList"><span
    246. 

  246.          class="ci">ErrorMessageList</span></a></code> stored in the <code class="fsharp"><a href="primitives.html#members.Reply"><span
    247. 

  247.          class="ci">Reply</span></a><span class="cp">&lt;</span><span class="ci">_</span><span class="cp">,</span><span class="ci">_</span><span
    248. 

  248.          class="cp">&gt;</span><span class="cp">.</span><a href="primitives.html#members.Error"><span class="ci">Error</span></a></code> field
    249. 

  249.          describe an error at the position of the <code class="fsharp"><a href="primitives.html#members.Reply"><span class="ci">Reply</span></a><span
    250. 

  250.          class="cp">&lt;</span><span class="ci">_</span><span class="cp">,</span><span class="ci">_</span><span class="cp">&gt;</span><span
    251. 

  251.          class="cp">.</span><a href="state.html"><span class="ci">State</span></a></code> value. The <code class="fsharp"><a
    252. 

  252.          href="#members.ParserError"><span class="ci">ParserError</span></a></code> type is a convenient container type for binding together an <code
    253. 

  253.          class="fsharp"><a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a></code> with its associated position.
    254. 

  254.         </p>
    255. 

  255.         <p class="para _3"><code class="fsharp"><span class="ci">ErrorMessage</span></code> has the following union cases:</p>
    256. 

  256.         <div class="para _4">
    257. 

  257.          <div class="interface-members">
    258. 

  258.           <div class="interface-member _1" id="members.Expected">
    259. 

  259.            <div class="interface-member-code">
    260. 

  260.             <a class="interface-member-backlink" href="#interface.Expected:B:">⇧</a>
    261. 

  261. <pre class="code fsharp"><span class="cp">|</span> <span class="interface-member-marker"><span class="ci">Expected</span></span> <span class="ck">of</span> <span class="ci">string</span>
    262. 

  262. </pre>
    263. 

  263.            </div>
    264. 

  264.            <div class="interface-member-description">
    265. 

  265.             <p class="para _1">
    266. 

  266.              Parsers report this <code class="fsharp"><span class="ci">ErrorMessage</span></code> when the input does not match the expected input.
    267. 

  267.              The string argument describes the expected input.
    268. 

  268.             </p>
    269. 

  269.             <p class="para _2">
    270. 

  270.              This error message can be generated with the labeling operator <code class="fsharp"><a href="primitives.html#members.:60::63::62:"><span
    271. 

  271.              class="co">&lt;?&gt;</span></a></code>.
    272. 

  272.             </p>
    273. 

  273.            </div>
    274. 

  274.           </div>
    275. 

  275.           <div class="interface-member _2" id="members.ExpectedString">
    276. 

  276.            <div class="interface-member-code">
    277. 

  277.             <a class="interface-member-backlink" href="#interface.ExpectedString:B:">⇧</a>
    278. 

  278. <pre class="code fsharp"><span class="cp">|</span> <span class="interface-member-marker"><span class="ci">ExpectedString</span></span> <span class="ck">of</span> <span class="ci">string</span>
    279. 

  279. </pre>
    280. 

  280.            </div>
    281. 

  281.            <div class="interface-member-description">
    282. 

  282.             <p class="para _1">
    283. 

  283.              Parsers report this <code class="fsharp"><span class="ci">ErrorMessage</span></code> when the input does not match an expected string
    284. 

  284.              constant. The constructor argument is the expected string constant.
    285. 

  285.             </p>
    286. 

  286.             <p class="para _2">
    287. 

  287.              This <code class="fsharp"><span class="ci">ErrorMessage</span></code> is mainly generated by the <code class="fsharp"><a
    288. 

  288.              href="charparsers.html#members.pchar"><span class="ci">pchar</span></a></code> and <code class="fsharp"><a
    289. 

  289.              href="charparsers.html#members.pstring"><span class="ci">pstring</span></a></code> parsers and its variants.
    290. 

  290.             </p>
    291. 

  291.            </div>
    292. 

  292.           </div>
    293. 

  293.           <div class="interface-member _3" id="members.ExpectedStringCI">
    294. 

  294.            <div class="interface-member-code">
    295. 

  295.             <a class="interface-member-backlink" href="#interface.ExpectedStringCI:B:">⇧</a>
    296. 

  296. <pre class="code fsharp"><span class="cp">|</span> <span class="interface-member-marker"><span class="ci">ExpectedStringCI</span></span> <span class="ck">of</span> <span class="ci">string</span>
    297. 

  297. </pre>
    298. 

  298.            </div>
    299. 

  299.            <div class="interface-member-description">
    300. 

  300.             <p class="para _1">
    301. 

  301.              Parsers report this <code class="fsharp"><span class="ci">ErrorMessage</span></code> when the input does not match an expected
    302. 

  302.              case‐insensitive string constant. The constructor argument is the expected string constant.
    303. 

  303.             </p>
    304. 

  304.             <p class="para _2">
    305. 

  305.              This <code class="fsharp"><span class="ci">ErrorMessage</span></code> is mainly generated by the <code class="fsharp"><a
    306. 

  306.              href="charparsers.html#members.pstringCI"><span class="ci">pstringCI</span></a></code> parsers and its variants.
    307. 

  307.             </p>
    308. 

  308.            </div>
    309. 

  309.           </div>
    310. 

  310.           <div class="interface-member _4" id="members.Unexpected">
    311. 

  311.            <div class="interface-member-code">
    312. 

  312.             <a class="interface-member-backlink" href="#interface.Unexpected:B:">⇧</a>
    313. 

  313. <pre class="code fsharp"><span class="cp">|</span> <span class="interface-member-marker"><span class="ci">Unexpected</span></span> <span class="ck">of</span> <span class="ci">string</span>
    314. 

  314. </pre>
    315. 

  315.            </div>
    316. 

  316.            <div class="interface-member-description">
    317. 

  317.             <p class="para _1">
    318. 

  318.              Parsers report this <code class="fsharp"><span class="ci">ErrorMessage</span></code> when they encounter some unexpected input. The
    319. 

  319.              string argument describes the unexpected input.
    320. 

  320.             </p>
    321. 

  321.             <p class="para _2">
    322. 

  322.              This <code class="fsharp"><span class="ci">ErrorMessage</span></code> is mainly generated by the <code class="fsharp"><a
    323. 

  323.              href="primitives.html#members.notFollowedByL"><span class="ci">notFollowedByL</span></a></code> primitive.
    324. 

  324.             </p>
    325. 

  325.            </div>
    326. 

  326.           </div>
    327. 

  327.           <div class="interface-member _5" id="members.UnexpectedString">
    328. 

  328.            <div class="interface-member-code">
    329. 

  329.             <a class="interface-member-backlink" href="#interface.UnexpectedString:B:">⇧</a>
    330. 

  330. <pre class="code fsharp"><span class="cp">|</span> <span class="interface-member-marker"><span class="ci">UnexpectedString</span></span> <span class="ck">of</span> <span class="ci">string</span>
    331. 

  331. </pre>
    332. 

  332.            </div>
    333. 

  333.            <div class="interface-member-description">
    334. 

  334.             <p class="para _1">
    335. 

  335.              Parsers report this <code class="fsharp"><span class="ci">ErrorMessage</span></code> when they encounter an unexpected string constant.
    336. 

  336.              The constructor argument is the unexpected string.
    337. 

  337.             </p>
    338. 

  338.             <p class="para _2">
    339. 

  339.              This <code class="fsharp"><span class="ci">ErrorMessage</span></code> is mainly generated by the <code class="fsharp"><a
    340. 

  340.              href="charparsers.html#members.notFollowedByChar"><span class="ci">notFollowedByChar</span></a></code> and <code class="fsharp"><a
    341. 

  341.              href="charparsers.html#members.notFollowedByString"><span class="ci">notFollowedByString</span></a></code> parsers.
    342. 

  342.             </p>
    343. 

  343.            </div>
    344. 

  344.           </div>
    345. 

  345.           <div class="interface-member _6" id="members.UnexpectedStringCI">
    346. 

  346.            <div class="interface-member-code">
    347. 

  347.             <a class="interface-member-backlink" href="#interface.UnexpectedStringCI:B:">⇧</a>
    348. 

  348. <pre class="code fsharp"><span class="cp">|</span> <span class="interface-member-marker"><span class="ci">UnexpectedStringCI</span></span> <span class="ck">of</span> <span class="ci">string</span>
    349. 

  349. </pre>
    350. 

  350.            </div>
    351. 

  351.            <div class="interface-member-description">
    352. 

  352.             <p class="para _1">
    353. 

  353.              Parsers report this <code class="fsharp"><span class="ci">ErrorMessage</span></code> when they encounter an unexpected case‐insensitive
    354. 

  354.              string constant. The constructor argument is the unexpected string.
    355. 

  355.             </p>
    356. 

  356.             <p class="para _2">
    357. 

  357.              This <code class="fsharp"><span class="ci">ErrorMessage</span></code> is mainly generated by the <code class="fsharp"><a
    358. 

  358.              href="charparsers.html#members.notFollowedByStringCI"><span class="ci">notFollowedByStringCI</span></a></code> parsers.
    359. 

  359.             </p>
    360. 

  360.            </div>
    361. 

  361.           </div>
    362. 

  362.           <div class="interface-member _7" id="members.Message">
    363. 

  363.            <div class="interface-member-code">
    364. 

  364.             <a class="interface-member-backlink" href="#interface.Message:B:">⇧</a>
    365. 

  365. <pre class="code fsharp"><span class="cp">|</span> <span class="interface-member-marker"><span class="ci">Message</span></span> <span class="ck">of</span> <span class="ci">string</span>
    366. 

  366. </pre>
    367. 

  367.            </div>
    368. 

  368.            <div class="interface-member-description">
    369. 

  369.             <p class="para _1">
    370. 

  370.              Parsers report this <code class="fsharp"><span class="ci">ErrorMessage</span></code> when an the error does not fit into the other
    371. 

  371.              categories. The string argument contains the error message.
    372. 

  372.             </p>
    373. 

  373.             <p class="para _2">
    374. 

  374.              This error message can be generated with the <code class="fsharp"><a href="primitives.html#members.fail"><span
    375. 

  375.              class="ci">fail</span></a></code> and <code class="fsharp"><a href="primitives.html#members.failFatally"><span
    376. 

  376.              class="ci">failFatally</span></a></code> primitives.
    377. 

  377.             </p>
    378. 

  378.            </div>
    379. 

  379.           </div>
    380. 

  380.           <div class="interface-member _8" id="members.CompoundError">
    381. 

  381.            <div class="interface-member-code">
    382. 

  382.             <a class="interface-member-backlink" href="#interface.CompoundError:B:">⇧</a>
    383. 

  383. <pre class="code fsharp"><span class="cp">|</span> <span class="interface-member-marker"><span class="ci">CompoundError</span></span> <span class="ck">of</span> <span class="ci">string</span> <span class="cp">*</span> <a href="position.html"><span class="ci">Position</span></a> <span class="cp">*</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    384. 

  384. </pre>
    385. 

  385.            </div>
    386. 

  386.            <div class="interface-member-description">
    387. 

  387.             <p class="para _1">
    388. 

  388.              Parsers report this <code class="fsharp"><span class="ci">ErrorMessage</span></code> when a &#x201C;compound&#x201D; failed to parse. The
    389. 

  389.              constructor arguments are a label for the compound parser and the error (<code class="fsharp"><a href="#members.Position"><span
    390. 

  390.              class="ci">Position</span></a></code> + <code class="fsharp"><a href="#members.ErrorMessageList"><span
    391. 

  391.              class="ci">ErrorMessageList</span></a></code>) that caused the compound to fail to parse.
    392. 

  392.             </p>
    393. 

  393.             <p class="para _2">
    394. 

  394.              This error message is mainly generated by the compound‐labelling operator <code class="fsharp"><a
    395. 

  395.              href="primitives.html#members.:60::63::63::62:"><span class="co">&lt;??&gt;</span></a></code>.
    396. 

  396.             </p>
    397. 

  397.            </div>
    398. 

  398.           </div>
    399. 

  399.           <div class="interface-member _9" id="members.BacktrackPoint">
    400. 

  400.            <div class="interface-member-code">
    401. 

  401.             <a class="interface-member-backlink" href="#interface.BacktrackPoint:B:">⇧</a>
    402. 

  402. <pre class="code fsharp"><span class="cp">|</span> <span class="interface-member-marker"><span class="ci">BacktrackPoint</span></span> <span class="ck">of</span> <a href="position.html"><span class="ci">Position</span></a> <span class="cp">*</span> <a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a>
    403. 

  403. </pre>
    404. 

  404.            </div>
    405. 

  405.            <div class="interface-member-description">
    406. 

  406.             <p class="para _1">
    407. 

  407.              Parsers report this <code class="fsharp"><span class="ci">ErrorMessage</span></code> when they backtracked after an error occurred. The
    408. 

  408.              constructor argument is the error (<code class="fsharp"><a href="#members.Position"><span class="ci">Position</span></a></code> + <code
    409. 

  409.              class="fsharp"><a href="#members.ErrorMessageList"><span class="ci">ErrorMessageList</span></a></code>) that occurred before the
    410. 

  410.              backtracking.
    411. 

  411.             </p>
    412. 

  412.             <p class="para _2">
    413. 

  413.              This error message is mainly generated by the <code class="fsharp"><a href="primitives.html#members.attempt"><span
    414. 

  414.              class="ci">attempt</span></a></code>, <code class="fsharp"><a href="primitives.html#members.:62::62::63:"><span
    415. 

  415.              class="co">&gt;&gt;?</span></a></code> and <code class="fsharp"><a href="primitives.html#members.:.::62::62::63:"><span
    416. 

  416.              class="co">.&gt;&gt;?</span></a></code> primitives.
    417. 

  417.             </p>
    418. 

  418.            </div>
    419. 

  419.           </div>
    420. 

  420.           <div class="interface-member _0" id="members.OtherError">
    421. 

  421.            <div class="interface-member-code">
    422. 

  422.             <a class="interface-member-backlink" href="#interface.OtherError:B:">⇧</a>
    423. 

  423. <pre class="code fsharp"><span class="cp">|</span> <span class="interface-member-marker"><span class="ci">OtherError</span></span> <span class="ck">of</span> <a href="http://msdn.microsoft.com/en-us/library/system.icomparable.aspx"><span class="ci">System</span><span class="cm">.</span><span class="ci">IComparable</span></a>
    424. 

  424. </pre>
    425. 

  425.            </div>
    426. 

  426.            <div class="interface-member-description">
    427. 

  427.             <p class="para _1">
    428. 

  428.              User‐defined parsers can return this <code class="fsharp"><span class="ci">ErrorMessage</span></code> to report application‐specific
    429. 

  429.              error data. The object argument contains the error data.
    430. 

  430.             </p>
    431. 

  431.             <p class="para _2">
    432. 

  432.              To display <code class="fsharp"><span class="ci">OtherError</span></code> values in error messages, you will have to define your own
    433. 

  433.              error printer, as <code class="fsharp"><a href="#members.ParserError"><span class="ci">ParserError</span></a><span class="cm">.</span><a
    434. 

  434.              href="#interface.ToString:47:WriteTo"><span class="ci">ToString</span><span class="co">/</span><span class="ci">WriteTo</span></a></code>
    435. 

  435.              ignores them.
    436. 

  436.             </p>
    437. 

  437.            </div>
    438. 

  438.           </div>
    439. 

  439.          </div>
    440. 

  440.         </div>
    441. 

  441.        </div>
    442. 

  442.       </div>
    443. 

  443.       <div class="interface-member _2" id="members.ErrorMessageList">
    444. 

  444.        <div class="interface-member-code">
    445. 

  445.         <a class="interface-member-backlink" href="#interface.ErrorMessageList:B:">⇧</a>
    446. 

  446. <pre class="code fsharp"><span class="ck">type</span> <span class="interface-member-marker"><span class="ci">ErrorMessageList</span></span></pre>
    447. 

  447.        </div>
    448. 

  448.        <div class="interface-member-description">
    449. 

  449.         <p class="para _1">
    450. 

  450.          This union type represents a list of error messages in which the order of the messages carries no meaning and any duplicates and empty
    451. 

  451.          messages are ignored. Essentially, an <code class="fsharp"><span class="ci">ErrorMessageList</span></code> is <em>constructed as a list, but
    452. 

  452.          interpreted as a set</em>.
    453. 

  453.         </p>
    454. 

  454.         <p class="para _2">
    455. 

  455.          All <code class="fsharp"><a href="#members.ErrorMessage"><span class="ci">ErrorMessage</span></a></code> values in an <code
    456. 

  456.          class="fsharp"><span class="ci">ErrorMessageList</span></code> are associated with the same input stream position. For example, the error
    457. 

  457.          messages stored in the <code class="fsharp"><a href="primitives.html#members.Reply"><span class="ci">Reply</span></a><span
    458. 

  458.          class="cp">&lt;</span><span class="ci">_</span><span class="cp">,</span><span class="ci">_</span><span class="cp">&gt;</span><span
    459. 

  459.          class="cp">.</span><a href="primitives.html#members.Error"><span class="ci">Error</span></a></code> field describe an error at the position
    460. 

  460.          of the <code class="fsharp"><a href="primitives.html#members.Reply"><span class="ci">Reply</span></a><span class="cp">&lt;</span><span
    461. 

  461.          class="ci">_</span><span class="cp">,</span><span class="ci">_</span><span class="cp">&gt;</span><span class="cp">.</span><a
    462. 

  462.          href="state.html"><span class="ci">State</span></a></code> value. The <code class="fsharp"><a href="#members.ParserError"><span
    463. 

  463.          class="ci">ParserError</span></a></code> type is a convenient container type for binding together an <code class="fsharp"><span
    464. 

  464.          class="ci">ErrorMessageList</span></code> with its associated position.
    465. 

  465.         </p>
    466. 

  466.         <p class="para _3">
    467. 

  467.          The easiest way to process an <code class="fsharp"><span class="ci">ErrorMessageList</span></code> as a set is to convert it into an actual
    468. 

  468.          set by using the <code class="fsharp"><a href="#members.ToSet"><span class="ci">ToSet</span></a></code> member. For example, the <code
    469. 

  469.          class="fsharp"><a href="#members.ParserError"><span class="ci">ParserError</span></a><span class="cm">.</span><a
    470. 

  470.          href="#members.WriteTo"><span class="ci">WriteTo</span></a></code> method uses this method to filter out duplicates before printing out the
    471. 

  471.          messages.
    472. 

  472.         </p>
    473. 

  473.         <p class="para _4">
    474. 

  474.          In order to enforce set semantics in comparison operations, the <code class="fsharp"><span class="ci">ErrorMessageList</span></code>
    475. 

  475.          overrides the <code class="fsharp"><span class="ci">Equals</span></code>, <code class="fsharp"><span class="ci">GetHashCode</span></code> and
    476. 

  476.          <code class="fsharp"><span class="ci">CompareTo</span></code> methods.
    477. 

  477.         </p>
    478. 

  478.         <div class="para _5">
    479. 

  479.          <div class="interface-members">
    480. 

  480.           <div class="interface-member _1" id="members.AddErrorMessage">
    481. 

  481.            <div class="interface-member-code">
    482. 

  482.             <a class="interface-member-backlink" href="#interface.AddErrorMessage:B:">⇧</a>
    483. 

  483. <pre class="code fsharp"><span class="cp">|</span> <span class="interface-member-marker"><span class="ci">AddErrorMessage</span></span> <span class="ck">of</span> <a href="#members.ErrorMessage"><span class="ci">ErrorMessage</span></a> <span class="cp">*</span> <span class="ci">ErrorMessageList</span>
    484. 

  484. </pre>
    485. 

  485.            </div>
    486. 

  486.            <div class="interface-member-description">
    487. 

  487.             <p class="para _1">
    488. 

  488.              Creates a new <code class="fsharp"><span class="ci">ErrorMessageList</span></code> with the given &#x201C;head&#x201D; and
    489. 

  489.              &#x201C;tail&#x201D;.
    490. 

  490.             </p>
    491. 

  491.             <div class="para _2">
    492. 

  492.              <p>For example,</p>
    493. 

  493. <pre class="code fsharp"><span class="ci">AddErrorMessage</span><span class="cp">(</span><a href="#members.Expected"><span class="ci">Expected</span></a> <span class="cs"><span class="left-delimiter">"</span>a<span class="right-delimiter">"</span></span><span class="cp">,</span>
    494. 

  494.                 <span class="ci">AddErrorMessage</span><span class="cp">(</span><a href="#members.Expected"><span class="ci">Expected</span></a> <span class="cs"><span class="left-delimiter">"</span>b<span class="right-delimiter">"</span></span><span class="cp">,</span> <a href="#members.NoErrorMessages"><span class="ci">NoErrorMessages</span></a><span class="cp">)</span><span class="cp">)</span>
    495. 

  495. </pre>
    496. 

  496.              <p>creates an <code class="fsharp"><span class="ci">ErrorMessageList</span></code> with two error messages.</p>
    497. 

  497.             </div>
    498. 

  498.            </div>
    499. 

  499.           </div>
    500. 

  500.           <div class="interface-member _2" id="members.NoErrorMessages">
    501. 

  501.            <div class="interface-member-code">
    502. 

  502.             <a class="interface-member-backlink" href="#interface.NoErrorMessages:B:">⇧</a>
    503. 

  503. <pre class="code fsharp"><span class="cp">|</span> <span class="interface-member-marker"><span class="ci">NoErrorMessages</span></span>
    504. 

  504. </pre>
    505. 

  505.            </div>
    506. 

  506.            <div class="interface-member-description">
    507. 

  507.             <p class="para _1">
    508. 

  508.              The empty <code class="fsharp"><span class="ci">ErrorMessageList</span></code>. This value is represented as <code class="fsharp"><span
    509. 

  509.              class="cnu">null</span></code>.
    510. 

  510.             </p>
    511. 

  511.            </div>
    512. 

  512.           </div>
    513. 

  513.           <div class="interface-member _3" id="members.ToSet">
    514. 

  514.            <div class="interface-member-code">
    515. 

  515.             <a class="interface-member-backlink" href="#interface.ToSet:B:">⇧</a>
    516. 

  516. <pre class="code fsharp"><span class="ck">member</span> <span class="interface-member-marker"><span class="ci">ToSet</span></span><span class="cp">:</span> <span class="ci">unit</span> <span class="cr">-&gt;</span> <span class="ci">Set</span><span class="cp">&lt;</span><a href="#members.ErrorMessage"><span class="ci">ErrorMessage</span></a><span class="cp">&gt;</span>
    517. 

  517. </pre>
    518. 

  518.            </div>
    519. 

  519.            <div class="interface-member-description">
    520. 

  520.             <p class="para _1">
    521. 

  521.              Converts the <code class="fsharp"><span class="ci">ErrorMessageList</span></code> to a <code class="fsharp"><span
    522. 

  522.              class="ci">Set</span><span class="cp">&lt;</span><span class="ci">ErrorMessageList</span><span class="cp">&gt;</span></code>. Duplicate
    523. 

  523.              error messages and empty <code class="fsharp"><a href="#members.Expected"><span class="ci">Expected</span></a></code>, <code
    524. 

  524.              class="fsharp"><a href="#members.Unexpected"><span class="ci">Unexpected</span></a></code> and <code class="fsharp"><a
    525. 

  525.              href="#members.Message"><span class="ci">Message</span></a></code> messages are filtered out when the list is converted to a set.
    526. 

  526.             </p>
    527. 

  527.            </div>
    528. 

  528.           </div>
    529. 

  529.           <div class="interface-member _4" id="members.OfSeq">
    530. 

  530.            <div class="interface-member-code">
    531. 

  531.             <a class="interface-member-backlink" href="#interface.OfSeq:B:">⇧</a>
    532. 

  532. <pre class="code fsharp"><span class="ck">static</span> <span class="ck">member</span> <span class="interface-member-marker"><span class="ci">OfSeq</span></span><span class="cp">:</span> <span class="ci…
    533.