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    <body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
          <a class="bz_bug_link 
          bz_status_REOPENED "
   title="REOPENED - Failure to partially order constrained overload set of three parameters"
   href="https://bugs.llvm.org/show_bug.cgi?id=44661">bug 44661</a>
          <br>
             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">Resolution</td>
           <td>INVALID
           </td>
           <td>---
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">CC</td>
           <td>
                
           </td>
           <td>saar@raz.email
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Status</td>
           <td>RESOLVED
           </td>
           <td>REOPENED
           </td>
         </tr></table>
      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_REOPENED "
   title="REOPENED - Failure to partially order constrained overload set of three parameters"
   href="https://bugs.llvm.org/show_bug.cgi?id=44661#c2">Comment # 2</a>
              on <a class="bz_bug_link 
          bz_status_REOPENED "
   title="REOPENED - Failure to partially order constrained overload set of three parameters"
   href="https://bugs.llvm.org/show_bug.cgi?id=44661">bug 44661</a>
              from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
        <pre>Presumably the IFNDR is because the candidates are functionally equivalent but
not equivalent. That's easy to rectify:


template<typename>
concept c1 = true;

template<typename, typename>
concept c2 = true;

template<
        c1 T1,
        c2<int> T2,
        c1 T3,
        typename T4 = int
>
int f(T1, T2, T3, T4 = 0);

template<
        c1 T1,
        c2<int> T2,
        typename T3
>
int f(T1, T2, T3);


... and Clang still reports this as ambiguous, which it isn't.</pre>
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