diff --git a/index.html b/index.html
index b88aa974..a0dfbde1 100644
--- a/index.html
+++ b/index.html
@@ -303,7 +303,7 @@ <h2 id="combining-parsers" class="section"><a class="anchor-link left" href="#co
 //       )
 //     )
 //   ),
-//   fn = cats.parse.Parser$$Lambda$11824/1085575377@610c529e
+//   fn = cats.parse.Parser$$Lambda$10130/1908155089@14a04857
 // )
 </span><span>
 </span><span class="comment">// still error since we need the space even if we drop it
@@ -342,7 +342,7 @@ <h2 id="combining-parsers" class="section"><a class="anchor-link left" href="#co
 //           ranges = NonEmptyList(head = (&#39;A&#39;, &#39;Z&#39;), tail = List((&#39;a&#39;, &#39;z&#39;)))
 //         )
 //       ),
-//       fn = cats.parse.Parser$$Lambda$11822/159645984@672e3caa
+//       fn = cats.parse.Parser$$Lambda$10128/47792730@50a1e599
 //     ),
 //     second = Void(
 //       parser = CharIn(
@@ -352,7 +352,7 @@ <h2 id="combining-parsers" class="section"><a class="anchor-link left" href="#co
 //       )
 //     )
 //   ),
-//   fn = cats.parse.Parser$$Lambda$11824/1085575377@610c529e
+//   fn = cats.parse.Parser$$Lambda$10130/1908155089@14a04857
 // )
 </span><span class="keyword">val</span><span> </span><span class="identifier">p5</span><span>: </span><span class="type-name">Parser</span><span>[</span><span class="type-name">Char</span><span>] = </span><span class="identifier">alpha</span><span>.</span><span class="identifier">surroundedBy</span><span>(</span><span class="identifier">sp</span><span>)
 </span><span class="comment">// p5: Parser[Char] = Map(
@@ -379,7 +379,7 @@ <h2 id="combining-parsers" class="section"><a class="anchor-link left" href="#co
 //       )
 //     )
 //   ),
-//   fn = cats.parse.Parser$$Lambda$11825/264616883@6ee09f3
+//   fn = cats.parse.Parser$$Lambda$10131/404354252@3b47a59f
 // )
 </span><span>
 </span><span class="identifier">p4</span><span>.</span><span class="identifier">parse</span><span>(</span><span class="string-literal">&quot; a &quot;</span><span>)
@@ -409,7 +409,7 @@ <h2 id="combining-parsers" class="section"><a class="anchor-link left" href="#co
 //           ranges = NonEmptyList(head = (&#39;A&#39;, &#39;Z&#39;), tail = List((&#39;a&#39;, &#39;z&#39;)))
 //         )
 //       ),
-//       fn = cats.parse.Parser$$Lambda$11822/159645984@672e3caa
+//       fn = cats.parse.Parser$$Lambda$10128/47792730@50a1e599
 //     ),
 //     second = Void(
 //       parser = CharIn(
@@ -419,7 +419,7 @@ <h2 id="combining-parsers" class="section"><a class="anchor-link left" href="#co
 //       )
 //     )
 //   ),
-//   fn = cats.parse.Parser$$Lambda$11824/1085575377@610c529e
+//   fn = cats.parse.Parser$$Lambda$10130/1908155089@14a04857
 // )
 </span><span class="keyword">val</span><span> </span><span class="identifier">p7</span><span>: </span><span class="type-name">Parser</span><span>[</span><span class="type-name">Char</span><span>] = </span><span class="identifier">alpha</span><span>.</span><span class="identifier">between</span><span>(</span><span class="identifier">sp</span><span>, </span><span class="identifier">digit</span><span>)
 </span><span class="comment">// p7: Parser[Char] = Map(
@@ -446,7 +446,7 @@ <h2 id="combining-parsers" class="section"><a class="anchor-link left" href="#co
 //       )
 //     )
 //   ),
-//   fn = cats.parse.Parser$$Lambda$11825/264616883@6ee09f3
+//   fn = cats.parse.Parser$$Lambda$10131/404354252@3b47a59f
 // )
 </span><span>
 </span><span class="identifier">p6</span><span>.</span><span class="identifier">parse</span><span>(</span><span class="string-literal">&quot; a1&quot;</span><span>)
@@ -497,7 +497,7 @@ <h2 id="repeating-parsers" class="section"><a class="anchor-link left" href="#re
 //   ),
 //   min = 1,
 //   maxMinusOne = 2147483647,
-//   acc1 = cats.parse.Accumulator$$anon$12@15e296ba
+//   acc1 = cats.parse.Accumulator$$anon$12@30db5660
 // )
 </span><span class="keyword">val</span><span> </span><span class="identifier">p2</span><span>: </span><span class="type-name">Parser0</span><span>[</span><span class="type-name">List</span><span>[</span><span class="type-name">Char</span><span>]] = </span><span class="identifier">alpha</span><span>.</span><span class="identifier">rep0</span><span>
 </span><span class="comment">// p2: Parser0[List[Char]] = OneOf0(
@@ -510,7 +510,7 @@ <h2 id="repeating-parsers" class="section"><a class="anchor-link left" href="#re
 //       ),
 //       min = 1,
 //       maxMinusOne = 2147483647,
-//       acc1 = cats.parse.Accumulator0$$anon$9@16f9ae3a
+//       acc1 = cats.parse.Accumulator0$$anon$9@262f42dc
 //     ),
 //     Pure(result = List())
 //   )
@@ -552,7 +552,7 @@ <h2 id="repeating-parsers" class="section"><a class="anchor-link left" href="#re
 //     ),
 //     min = 1,
 //     maxMinusOne = 2147483647,
-//     acc1 = cats.parse.Accumulator$$anon$12@a41b23
+//     acc1 = cats.parse.Accumulator$$anon$12@797de6ad
 //   ),
 //   fn = &lt;function1&gt;
 // )
@@ -567,7 +567,7 @@ <h2 id="repeating-parsers" class="section"><a class="anchor-link left" href="#re
 //     ),
 //     min = 1,
 //     maxMinusOne = 2147483647,
-//     acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//     acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 //   )
 // )
 </span><span class="keyword">val</span><span> </span><span class="identifier">p3</span><span>: </span><span class="type-name">Parser</span><span>[</span><span class="type-name">String</span><span>] = </span><span class="identifier">alpha</span><span>.</span><span class="identifier">repAs</span><span>[</span><span class="type-name">String</span><span>]
@@ -579,7 +579,7 @@ <h2 id="repeating-parsers" class="section"><a class="anchor-link left" href="#re
 //   ),
 //   min = 1,
 //   maxMinusOne = 2147483647,
-//   acc1 = cats.parse.Accumulator0$$anon$7@77253467
+//   acc1 = cats.parse.Accumulator0$$anon$7@1592ee94
 // )</span></code></pre>
         <p>All three parsers will be identical in parsing results, but <code>p2</code> and <code>p3</code> are using built-in methods which will not create intermediate list. <code>rep</code> + <code>map</code> creates intermediate list which is mapped to string in this example.</p>
         
@@ -600,7 +600,7 @@ <h2 id="parsers-with-empty-output" class="section"><a class="anchor-link left" h
 //         ),
 //         min = 1,
 //         maxMinusOne = 2147483647,
-//         acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//         acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 //       ),
 //       second = OneOf0(
 //         all = List(
@@ -615,7 +615,7 @@ <h2 id="parsers-with-empty-output" class="section"><a class="anchor-link left" h
 //     ),
 //     min = 1,
 //     maxMinusOne = 2147483647,
-//     acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//     acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 //   )
 // )
 </span><span>
@@ -654,7 +654,7 @@ <h2 id="parsers-with-empty-output" class="section"><a class="anchor-link left" h
 //           ),
 //           min = 1,
 //           maxMinusOne = 2147483647,
-//           acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//           acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 //         ),
 //         second = OneOf0(
 //           all = List(
@@ -670,7 +670,7 @@ <h2 id="parsers-with-empty-output" class="section"><a class="anchor-link left" h
 //     ),
 //     min = 1,
 //     maxMinusOne = 2147483647,
-//     acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//     acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 //   )
 // )
 </span><span>
@@ -717,7 +717,7 @@ <h2 id="error-handling" class="section"><a class="anchor-link left" href="#error
 //       ranges = NonEmptyList(head = (&#39;A&#39;, &#39;Z&#39;), tail = List((&#39;a&#39;, &#39;z&#39;)))
 //     )
 //   ),
-//   fn = cats.parse.Parser$$Lambda$11822/159645984@672e3caa
+//   fn = cats.parse.Parser$$Lambda$10128/47792730@50a1e599
 // )
 </span><span>
 </span><span class="comment">// epsilon failure
@@ -768,7 +768,7 @@ <h3 id="backtrack" class="section"><a class="anchor-link left" href="#backtrack"
 //           ranges = NonEmptyList(head = (&#39;0&#39;, &#39;9&#39;), tail = List())
 //         )
 //       ),
-//       fn = cats.parse.Parser$$Lambda$11822/159645984@672e3caa
+//       fn = cats.parse.Parser$$Lambda$10128/47792730@50a1e599
 //     ),
 //     second = Void(
 //       parser = CharIn(
@@ -778,7 +778,7 @@ <h3 id="backtrack" class="section"><a class="anchor-link left" href="#backtrack"
 //       )
 //     )
 //   ),
-//   fn = cats.parse.Parser$$Lambda$11824/1085575377@610c529e
+//   fn = cats.parse.Parser$$Lambda$10130/1908155089@14a04857
 // )
 </span><span>
 </span><span class="identifier">p</span><span>.</span><span class="identifier">parse</span><span>(</span><span class="string-literal">&quot; 1&quot;</span><span>)
@@ -817,7 +817,7 @@ <h3 id="backtrack" class="section"><a class="anchor-link left" href="#backtrack"
 //           ranges = NonEmptyList(head = (&#39;0&#39;, &#39;9&#39;), tail = List())
 //         )
 //       ),
-//       fn = cats.parse.Parser$$Lambda$11822/159645984@672e3caa
+//       fn = cats.parse.Parser$$Lambda$10128/47792730@50a1e599
 //     ),
 //     second = Void(
 //       parser = CharIn(
@@ -827,7 +827,7 @@ <h3 id="backtrack" class="section"><a class="anchor-link left" href="#backtrack"
 //       )
 //     )
 //   ),
-//   fn = cats.parse.Parser$$Lambda$11824/1085575377@610c529e
+//   fn = cats.parse.Parser$$Lambda$10130/1908155089@14a04857
 // )
 </span><span class="keyword">val</span><span> </span><span class="identifier">p2</span><span> = </span><span class="identifier">sp</span><span> *&gt; </span><span class="identifier">digit</span><span>
 </span><span class="comment">// p2: cats.parse.Parser[Char] = Map(
@@ -845,7 +845,7 @@ <h3 id="backtrack" class="section"><a class="anchor-link left" href="#backtrack"
 //       ranges = NonEmptyList(head = (&#39;0&#39;, &#39;9&#39;), tail = List())
 //     )
 //   ),
-//   fn = cats.parse.Parser$$Lambda$11822/159645984@672e3caa
+//   fn = cats.parse.Parser$$Lambda$10128/47792730@50a1e599
 // )
 </span><span>
 </span><span class="identifier">p1</span><span>.</span><span class="identifier">backtrack</span><span>.</span><span class="identifier">orElse</span><span>(</span><span class="identifier">p2</span><span>).</span><span class="identifier">parse</span><span>(</span><span class="string-literal">&quot; 1&quot;</span><span>)
@@ -879,7 +879,7 @@ <h3 id="backtrack" class="section"><a class="anchor-link left" href="#backtrack"
 //           ranges = NonEmptyList(head = (&#39;0&#39;, &#39;9&#39;), tail = List())
 //         )
 //       ),
-//       fn = cats.parse.Parser$$Lambda$11822/159645984@672e3caa
+//       fn = cats.parse.Parser$$Lambda$10128/47792730@50a1e599
 //     ),
 //     second = Void(
 //       parser = CharIn(
@@ -889,7 +889,7 @@ <h3 id="backtrack" class="section"><a class="anchor-link left" href="#backtrack"
 //       )
 //     )
 //   ),
-//   fn = cats.parse.Parser$$Lambda$11824/1085575377@610c529e
+//   fn = cats.parse.Parser$$Lambda$10130/1908155089@14a04857
 // )
 </span><span class="keyword">val</span><span> </span><span class="identifier">p2</span><span> = </span><span class="identifier">sp</span><span> *&gt; </span><span class="identifier">digit</span><span>
 </span><span class="comment">// p2: cats.parse.Parser[Char] = Map(
@@ -907,7 +907,7 @@ <h3 id="backtrack" class="section"><a class="anchor-link left" href="#backtrack"
 //       ranges = NonEmptyList(head = (&#39;0&#39;, &#39;9&#39;), tail = List())
 //     )
 //   ),
-//   fn = cats.parse.Parser$$Lambda$11822/159645984@672e3caa
+//   fn = cats.parse.Parser$$Lambda$10128/47792730@50a1e599
 // )
 </span><span class="keyword">val</span><span> </span><span class="identifier">p3</span><span> = </span><span class="identifier">digit</span><span>
 </span><span class="comment">// p3: cats.parse.Parser[Char] = CharIn(
@@ -951,7 +951,7 @@ <h3 id="soft" class="section"><a class="anchor-link left" href="#soft"><i class=
 //     ),
 //     min = 1,
 //     maxMinusOne = 2147483647,
-//     acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//     acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 //   )
 // )
 </span><span>
@@ -966,7 +966,7 @@ <h3 id="soft" class="section"><a class="anchor-link left" href="#soft"><i class=
 //       ),
 //       min = 1,
 //       maxMinusOne = 2147483647,
-//       acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//       acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 //     )
 //   ),
 //   second = Void(
@@ -996,7 +996,7 @@ <h3 id="soft" class="section"><a class="anchor-link left" href="#soft"><i class=
 //               ),
 //               min = 1,
 //               maxMinusOne = 2147483647,
-//               acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//               acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 //             )
 //           ),
 //           second = Void(
@@ -1007,7 +1007,7 @@ <h3 id="soft" class="section"><a class="anchor-link left" href="#soft"><i class=
 //             )
 //           )
 //         ),
-//         fn = cats.parse.Parser0$$Lambda$11814/860915342@2cf6ccc7
+//         fn = cats.parse.Parser0$$Lambda$10120/909608691@49f77758
 //       ),
 //       second = StringP(
 //         parser = Rep(
@@ -1023,7 +1023,7 @@ <h3 id="soft" class="section"><a class="anchor-link left" href="#soft"><i class=
 //               ),
 //               min = 1,
 //               maxMinusOne = 2147483647,
-//               acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//               acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 // ...
 </span><span>
 
@@ -1061,7 +1061,7 @@ <h3 id="soft" class="section"><a class="anchor-link left" href="#soft"><i class=
 //               ),
 //               min = 1,
 //               maxMinusOne = 2147483647,
-//               acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//               acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 //             )
 //           ),
 //           second = Void(
@@ -1072,7 +1072,7 @@ <h3 id="soft" class="section"><a class="anchor-link left" href="#soft"><i class=
 //             )
 //           )
 //         ),
-//         fn = cats.parse.Parser0$$Lambda$11814/860915342@2cf6ccc7
+//         fn = cats.parse.Parser0$$Lambda$10120/909608691@49f77758
 //       ),
 //       second = StringP(
 //         parser = Rep(
@@ -1088,7 +1088,7 @@ <h3 id="soft" class="section"><a class="anchor-link left" href="#soft"><i class=
 //               ),
 //               min = 1,
 //               maxMinusOne = 2147483647,
-//               acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//               acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 // ...
 </span><span>
 </span><span class="keyword">val</span><span> </span><span class="identifier">p3</span><span> = (</span><span class="identifier">searchWord</span><span> ~ </span><span class="identifier">sp</span><span>.?).</span><span class="identifier">rep</span><span>.</span><span class="identifier">string</span><span>
@@ -1103,7 +1103,7 @@ <h3 id="soft" class="section"><a class="anchor-link left" href="#soft"><i class=
 //         ),
 //         min = 1,
 //         maxMinusOne = 2147483647,
-//         acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//         acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 //       ),
 //       second = OneOf0(
 //         all = List(
@@ -1118,7 +1118,7 @@ <h3 id="soft" class="section"><a class="anchor-link left" href="#soft"><i class=
 //     ),
 //     min = 1,
 //     maxMinusOne = 2147483647,
-//     acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//     acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 //   )
 // )
 </span><span>
@@ -1143,7 +1143,7 @@ <h3 id="soft" class="section"><a class="anchor-link left" href="#soft"><i class=
 //       ),
 //       min = 1,
 //       maxMinusOne = 2147483647,
-//       acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//       acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 //     )
 //   ),
 //   second = Void(
@@ -1173,7 +1173,7 @@ <h3 id="soft" class="section"><a class="anchor-link left" href="#soft"><i class=
 //               ),
 //               min = 1,
 //               maxMinusOne = 2147483647,
-//               acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//               acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 //             )
 //           ),
 //           second = Void(
@@ -1184,7 +1184,7 @@ <h3 id="soft" class="section"><a class="anchor-link left" href="#soft"><i class=
 //             )
 //           )
 //         ),
-//         fn = cats.parse.Parser0$$Lambda$11814/860915342@2cf6ccc7
+//         fn = cats.parse.Parser0$$Lambda$10120/909608691@49f77758
 //       ),
 //       second = StringP(
 //         parser = Rep(
@@ -1200,7 +1200,7 @@ <h3 id="soft" class="section"><a class="anchor-link left" href="#soft"><i class=
 //               ),
 //               min = 1,
 //               maxMinusOne = 2147483647,
-//               acc1 = cats.parse.Accumulator0$$anon$11@76732b55
+//               acc1 = cats.parse.Accumulator0$$anon$11@7f10cf40
 // ...
 </span><span>
 </span><span class="identifier">p4</span><span>.</span><span class="identifier">parse</span><span>(</span><span class="string-literal">&quot;title:The Wind Has Risen&quot;</span><span>)