<p>In <a href="https://github.com/mlpack/mlpack/pull/680#discussion_r66188192">src/mlpack/methods/emst/emst_main.cpp</a>:</p>
<pre style='color:#555'>&gt; @@ -34,8 +34,8 @@ PROGRAM_INFO(&quot;Fast Euclidean Minimum Spanning Tree&quot;, &quot;This program can compute &quot;
&gt;      &quot;column corresponds to the distance between the two points.&quot;);
&gt;  
&gt;  PARAM_STRING_REQ(&quot;input_file&quot;, &quot;Data input file.&quot;, &quot;i&quot;);
&gt; -PARAM_STRING(&quot;output_file&quot;, &quot;Data output file.  Stored as an edge list.&quot;, &quot;o&quot;,
&gt; -    &quot;emst_output.csv&quot;);
&gt; +PARAM_STRING_REQ(&quot;output_file&quot;, &quot;Data output file.  Stored as an edge list.&quot;,
&gt; +    &quot;o&quot;);
</pre>
<p>We shouldn't require the user to specify and output file, but we should print a warning ("output will not be saved", I think mlpack_knn does this) if they don't specify -o.</p>

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