ble t, Num a) =&gt; t a -&gt; a
</span
	><span class="hs-identifier hs-var"
	>sum</span
	></span
      ><span
      >
</span
      ><span id="line-27"
      ></span
      ><span
      >
</span
      ><span id="line-28"
      ></span
      ><span class="hs-keyword"
      >instance</span
      ><span
      > </span
      ><span id=""
      ><span id=""
	><span class="annot"
	  ><a href="Classes.html#Foo%27"
	    ><span class="hs-identifier hs-type"
	      >Foo'</span
	      ></a
	    ></span
	  ><span
	  > </