<html>
    <head>
      <base href="https://llvm.org/bugs/" />
    </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 --- - Assertion failed: 0 && "Invalid SLocOffset or bad function choice""
   href="https://llvm.org/bugs/show_bug.cgi?id=31922">31922</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Assertion failed: 0 && "Invalid SLocOffset or bad function choice"
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>new-bugs
          </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>new bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>yaron.keren@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>clang version 5.0.0 (trunk 294590)
clang -E file.cpp

where file.cpp is:
#define M(x) x
#include M(<a.h>)

and a.h is empty file in the same directory as file.cpp, results in

Assertion failed: 0 && "Invalid SLocOffset or bad function choice", file
C:\llvm\tools\clang\lib\Basic\SourceManager.cpp, line 817

the expected error would be to suggest using quotes "" to find a.h.</pre>
        </div>
      </p>
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