<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Template argument deduction not allowed in template parameter"
   href="https://bugs.llvm.org/show_bug.cgi?id=47841">47841</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Template argument deduction not allowed in template parameter
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>11.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows NT
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>C++2a
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>dudkindaniilm2@yandex.ru
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre><a href="https://godbolt.org/z/W8s74M">https://godbolt.org/z/W8s74M</a>

#include <array>

template <std::array Arr>
struct Foo {
};


<source>:3:11: error: use of class template 'array' requires template
arguments; argument deduction not allowed in template parameter

template <std::array Arr>

          ^~~

But latest C++20 draft says otherwise [temp.arg.nontype.1]:
<a href="http://eel.is/c++draft/temp.arg.nontype#1">http://eel.is/c++draft/temp.arg.nontype#1</a></pre>
        </div>
      </p>


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