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<html xmlns="http://www.w3.org/1999/xhtml"
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><pre
><span class="hs-pragma"
>{-# LANGUAGE RankNTypes #-}</span
><span
>
</span
><a name="line-2"
></a
><span class="hs-pragma"
>{-# LANGUAGE ScopedTypeVariables #-}</span
><span
>
</span
><a name="line-3"
></a
><span
>
</span
><a name="line-4"
></a
><span
>
</span
><a name="line-5"
></a
><span class="hs-keyword"
>module</span
><span
> </span
><span class="hs-identifier"
>Polymorphism</span
><span
> </span
><span class="hs-keyword"
>where</span
><span
>
</span
><a name="line-6"
></a
><span
>
</span
><a name="line-7"
></a
><span
>
</span
><a name="line-8"
></a
><span class="hs-identifier"
>foo</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
>
</span
><a name="line-9"
></a
><a name="foo"
><a href="Polymorphism.html#foo"
><span class="hs-identifier"
>foo</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><span class="hs-identifier hs-var"
>undefined</span
><span
>
</span
><a name="line-10"
></a
><span
>
</span
><a name="line-11"
></a
><span class="hs-identifier"
>foo'</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><span class="hs-keyword"
>forall</span
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>a</span
></a
></a
><span class="hs-operator"
>.</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
>
</span
><a name="line-12"
></a
><a name="foo%27"
><a href="Polymorphism.html#foo%27"
><span class="hs-identifier"
>foo'</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><span class="hs-identifier hs-var"
>undefined</span
><span
>
</span
><a name="line-13"
></a
><span
>
</span
><a name="line-14"
></a
><span class="hs-identifier"
>bar</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>(</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>,</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span class="hs-special"
>)</span
><span
>
</span
><a name="line-15"
></a
><a name="bar"
><a href="Polymorphism.html#bar"
><span class="hs-identifier"
>bar</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><span class="hs-identifier hs-var"
>undefined</span
><span
>
</span
><a name="line-16"
></a
><span
>
</span
><a name="line-17"
></a
><span class="hs-identifier"
>bar'</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><span class="hs-keyword"
>forall</span
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>a</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>b</span
></a
></a
><span class="hs-operator"
>.</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>(</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>,</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span class="hs-special"
>)</span
><span
>
</span
><a name="line-18"
></a
><a name="bar%27"
><a href="Polymorphism.html#bar%27"
><span class="hs-identifier"
>bar'</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><span class="hs-identifier hs-var"
>undefined</span
><span
>
</span
><a name="line-19"
></a
><span
>
</span
><a name="line-20"
></a
><span class="hs-identifier"
>baz</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>(</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>[</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>]</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span class="hs-special"
>)</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span
>
</span
><a name="line-21"
></a
><a name="baz"
><a href="Polymorphism.html#baz"
><span class="hs-identifier"
>baz</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><span class="hs-identifier hs-var"
>undefined</span
><span
>
</span
><a name="line-22"
></a
><span
>
</span
><a name="line-23"
></a
><span class="hs-identifier"
>baz'</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><span class="hs-keyword"
>forall</span
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>a</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>b</span
></a
></a
><span class="hs-operator"
>.</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>(</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>[</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>]</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span class="hs-special"
>)</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span
>
</span
><a name="line-24"
></a
><a name="baz%27"
><a href="Polymorphism.html#baz%27"
><span class="hs-identifier"
>baz'</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><span class="hs-identifier hs-var"
>undefined</span
><span
>
</span
><a name="line-25"
></a
><span
>
</span
><a name="line-26"
></a
><span class="hs-identifier"
>quux</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>(</span
><span class="hs-keyword"
>forall</span
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>a</span
></a
></a
><span class="hs-operator"
>.</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>)</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
>
</span
><a name="line-27"
></a
><a name="quux"
><a href="Polymorphism.html#quux"
><span class="hs-identifier"
>quux</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>x</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>f</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-var"
>f</span
></a
><span
> </span
><a href="#"
><span class="hs-identifier hs-var"
>x</span
></a
><span
>
</span
><a name="line-28"
></a
><span
>
</span
><a name="line-29"
></a
><span class="hs-identifier"
>quux'</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><span class="hs-keyword"
>forall</span
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>a</span
></a
></a
><span class="hs-operator"
>.</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>(</span
><span class="hs-keyword"
>forall</span
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>a</span
></a
></a
><span class="hs-operator"
>.</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>)</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
>
</span
><a name="line-30"
></a
><a name="quux%27"
><a href="Polymorphism.html#quux%27"
><span class="hs-identifier"
>quux'</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>x</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>f</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-var"
>f</span
></a
><span
> </span
><a href="#"
><span class="hs-identifier hs-var"
>x</span
></a
><span
>
</span
><a name="line-31"
></a
><span
>
</span
><a name="line-32"
></a
><span
>
</span
><a name="line-33"
></a
><span class="hs-identifier"
>num</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><span class="hs-identifier hs-type"
>Num</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>=></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
>
</span
><a name="line-34"
></a
><a name="num"
><a href="Polymorphism.html#num"
><span class="hs-identifier"
>num</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><span class="hs-identifier hs-var"
>undefined</span
><span
>
</span
><a name="line-35"
></a
><span
>
</span
><a name="line-36"
></a
><span class="hs-identifier"
>num'</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><span class="hs-keyword"
>forall</span
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>a</span
></a
></a
><span class="hs-operator"
>.</span
><span
> </span
><span class="hs-identifier hs-type"
>Num</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>=></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
>
</span
><a name="line-37"
></a
><a name="num%27"
><a href="Polymorphism.html#num%27"
><span class="hs-identifier"
>num'</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><span class="hs-identifier hs-var"
>undefined</span
><span
>
</span
><a name="line-38"
></a
><span
>
</span
><a name="line-39"
></a
><span class="hs-identifier"
>eq</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><span class="hs-special"
>(</span
><span class="hs-identifier hs-type"
>Eq</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>,</span
><span
> </span
><span class="hs-identifier hs-type"
>Eq</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span class="hs-special"
>)</span
><span
> </span
><span class="hs-glyph"
>=></span
><span
> </span
><span class="hs-special"
>[</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>]</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>[</span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span class="hs-special"
>]</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>(</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>,</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span class="hs-special"
>)</span
><span
>
</span
><a name="line-40"
></a
><a name="eq"
><a href="Polymorphism.html#eq"
><span class="hs-identifier"
>eq</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><span class="hs-identifier hs-var"
>undefined</span
><span
>
</span
><a name="line-41"
></a
><span
>
</span
><a name="line-42"
></a
><span class="hs-identifier"
>eq'</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><span class="hs-keyword"
>forall</span
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>a</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>b</span
></a
></a
><span class="hs-operator"
>.</span
><span
> </span
><span class="hs-special"
>(</span
><span class="hs-identifier hs-type"
>Eq</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>,</span
><span
> </span
><span class="hs-identifier hs-type"
>Eq</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span class="hs-special"
>)</span
><span
> </span
><span class="hs-glyph"
>=></span
><span
> </span
><span class="hs-special"
>[</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>]</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>[</span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span class="hs-special"
>]</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>(</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>,</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span class="hs-special"
>)</span
><span
>
</span
><a name="line-43"
></a
><a name="eq%27"
><a href="Polymorphism.html#eq%27"
><span class="hs-identifier"
>eq'</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><span class="hs-identifier hs-var"
>undefined</span
><span
>
</span
><a name="line-44"
></a
><span
>
</span
><a name="line-45"
></a
><span class="hs-identifier"
>mon</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><span class="hs-identifier hs-type"
>Monad</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>m</span
></a
><span
> </span
><span class="hs-glyph"
>=></span
><span
> </span
><span class="hs-special"
>(</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>m</span
></a
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>)</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>m</span
></a
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
>
</span
><a name="line-46"
></a
><a name="mon"
><a href="Polymorphism.html#mon"
><span class="hs-identifier"
>mon</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><span class="hs-identifier hs-var"
>undefined</span
><span
>
</span
><a name="line-47"
></a
><span
>
</span
><a name="line-48"
></a
><span class="hs-identifier"
>mon'</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><span class="hs-keyword"
>forall</span
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>m</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>a</span
></a
></a
><span class="hs-operator"
>.</span
><span
> </span
><span class="hs-identifier hs-type"
>Monad</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>m</span
></a
><span
> </span
><span class="hs-glyph"
>=></span
><span
> </span
><span class="hs-special"
>(</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>m</span
></a
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>)</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>m</span
></a
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
>
</span
><a name="line-49"
></a
><a name="mon%27"
><a href="Polymorphism.html#mon%27"
><span class="hs-identifier"
>mon'</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><span class="hs-identifier hs-var"
>undefined</span
><span
>
</span
><a name="line-50"
></a
><span
>
</span
><a name="line-51"
></a
><span
>
</span
><a name="line-52"
></a
><span class="hs-identifier"
>norf</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>(</span
><span class="hs-keyword"
>forall</span
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>a</span
></a
></a
><span class="hs-operator"
>.</span
><span
> </span
><span class="hs-identifier hs-type"
>Ord</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>=></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>)</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
>
</span
><a name="line-53"
></a
><a name="norf"
><a href="Polymorphism.html#norf"
><span class="hs-identifier"
>norf</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>x</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>f</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-var"
>x</span
></a
><span
>
</span
><a name="line-54"
></a
><span
>
</span
><a name="line-55"
></a
><span class="hs-identifier"
>norf'</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><span class="hs-keyword"
>forall</span
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>a</span
></a
></a
><span class="hs-operator"
>.</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>(</span
><span class="hs-keyword"
>forall</span
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>a</span
></a
></a
><span class="hs-operator"
>.</span
><span
> </span
><span class="hs-identifier hs-type"
>Ord</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>=></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>)</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
>
</span
><a name="line-56"
></a
><a name="norf%27"
><a href="Polymorphism.html#norf%27"
><span class="hs-identifier"
>norf'</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>x</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>f</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-var"
>x</span
></a
><span
>
</span
><a name="line-57"
></a
><span
>
</span
><a name="line-58"
></a
><span
>
</span
><a name="line-59"
></a
><span class="hs-identifier"
>plugh</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><span class="hs-keyword"
>forall</span
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>a</span
></a
></a
><span class="hs-operator"
>.</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
>
</span
><a name="line-60"
></a
><a name="plugh"
><a href="Polymorphism.html#plugh"
><span class="hs-identifier"
>plugh</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>x</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-var"
>x</span
></a
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
>
</span
><a name="line-61"
></a
><span
>
</span
><a name="line-62"
></a
><span class="hs-identifier"
>thud</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><span class="hs-keyword"
>forall</span
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>a</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>b</span
></a
></a
><span class="hs-operator"
>.</span
><span
> </span
><span class="hs-special"
>(</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span class="hs-special"
>)</span
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><span class="hs-special"
>(</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>,</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span class="hs-special"
>)</span
><span
>
</span
><a name="line-63"
></a
><a name="thud"
><a href="Polymorphism.html#thud"
><span class="hs-identifier"
>thud</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>f</span
></a
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>x</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
>
</span
><a name="line-64"
></a
><span
> </span
><span class="hs-special"
>(</span
><a href="#"
><span class="hs-identifier hs-var"
>x</span
></a
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>,</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-var"
>y</span
></a
><span class="hs-special"
>)</span
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><span class="hs-special"
>(</span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span class="hs-special"
>,</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span class="hs-special"
>)</span
><span
>
</span
><a name="line-65"
></a
><span
> </span
><span class="hs-keyword"
>where</span
><span
>
</span
><a name="line-66"
></a
><span
> </span
><a name=""
><a href="#"
><span class="hs-identifier"
>y</span
></a
></a
><span
> </span
><span class="hs-glyph"
>=</span
><span
> </span
><span class="hs-special"
>(</span
><a href="#"
><span class="hs-identifier hs-var"
>f</span
></a
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>a</span
></a
><span
> </span
><span class="hs-glyph"
>-></span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span class="hs-special"
>)</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-var"
>x</span
></a
><span
> </span
><span class="hs-glyph"
>::</span
><span
> </span
><a href="#"
><span class="hs-identifier hs-type"
>b</span
></a
><span
>
</span
><a name="line-67"
></a
></pre
></body
></html
>
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