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    <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 --- - [ThinLTO] Assertion `!(Pair.first != Ty && Pair.second == Ty) && "mapping to a source type"' failed"
   href="https://llvm.org/bugs/show_bug.cgi?id=28673">28673</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[ThinLTO] Assertion `!(Pair.first != Ty && Pair.second == Ty) && "mapping to a source type"' failed
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>lld
          </td>
        </tr>

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

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

        <tr>
          <th>OS</th>
          <td>All
          </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>ELF
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>twoh@fb.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>ld: /home/twoh/llvms/latest-dev/llvm/lib/Linker/IRMover.cpp:319: llvm::Type*
{anonymous}::TypeMapTy::get(llvm::Type*, llvm::SmallPtrSet<llvm::StructType*,
8u>&): Assertion `!(Pair.first != Ty && Pair.second == Ty) && "mapping to a
source type"' failed.
clang-3.9: error: unable to execute command: Aborted (core dumped)
clang-3.9: error: linker command failed due to signal (use -v to see
invocation)

Encountered the assertion failure while running ThinLTO.</pre>
        </div>
      </p>
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