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    <head>
      <base href="https://llvm.org/bugs/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW " title="NEW --- - clang could emit a different diagnosti when main() uses type deduction + fixIt" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24330&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=iq6cBWsiwPup-2JCKfqeBfrinuyIUgcGgqtKUVSzQ1I&s=YUMWVMdbrrY0LryRtpl4AC08X1NGJyNgExcZ3-eNcZ4&e=">24330</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>clang could emit a different diagnosti when main() uses type deduction + fixIt
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>unspecified
          </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++
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>davide@freebsd.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>This is mainly my personal taste, but I think clang could emit a different
diagnostic when 'auto' is used as return type, e.g. "
type-deduction is not allowed for main".

main.cpp:1:1: error: 'main' must return 'int'
auto main()
^~~~
int
1 error generated.


Also, it seems we emit a note in C but we don't in C++. Maybe a FixIt could be
used? i.e. "maybe you int main(void)"

./clang main.c
main.c:1:1: warning: return type of 'main' is not 'int' [-Wmain-return-type]
float main()
^
main.c:1:1: note: change return type to 'int'
float main()
^~~~~
int</pre>
        </div>
      </p>
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