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    <p>Actually in team, one who writes `_` match, is very useful as
      that prevents breaking code when adding new value...<br>
    </p>
    I can't really see any problem here. There is real world use case
    when member of team don't need to cover all cases therefore `_`.<br>
    <br>
    <div class="moz-cite-prefix">On 01/31/2017 05:59 AM, Saurabh Nanda
      wrote:<br>
    </div>
    <blockquote
cite="mid:CAPz=2oHDcB72SbgO_xNg-SxQ=yt4+Mir7baGTdi66q--HgnzSA@mail.gmail.com"
      type="cite">
      <div dir="auto">I would want the compiler (or linter) to help me
        here. Think if a mid-to-large team where everyone may not know
        (or remember) what the current best practices are. </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On 31 Jan 2017 9:51 am, "Michael
          Orlitzky" <<a moz-do-not-send="true"
            href="mailto:michael@orlitzky.com">michael@orlitzky.com</a>>
          wrote:<br type="attribution">
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">On
            01/30/2017 09:47 PM, Saurabh Nanda wrote:<br>
            > Hi,<br>
            ><br>
            > If I have the following ADT<br>
            ><br>
            > data BookingState = Confirmed | Cancelled<br>
            ><br>
            > which had a very high chance of being expanded in the
            future to have more<br>
            > values. How do I ensure that every pattern match on
            BookingState matches<br>
            > each value explicitly. Basically prevent the '_'
            matcher ?<br>
            ><br>
            <br>
            Don't write the "_" case? GHC will warn you about any
            pattern matches<br>
            you've missed.<br>
            <br>
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