<html>
    <head>
      <base href="http://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 --- - Incorrect error on undeclared variable use"
   href="http://llvm.org/bugs/show_bug.cgi?id=21656">21656</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Incorrect error on undeclared variable use
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>trunk
          </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>Frontend
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>Matthew.Arsenault@amd.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Using r222680

int main(int argc, char *argv[])
{
    float x = 1.0f;
    x = (float) arst;
}


This produces the unhelpful error:
error: operand of type '<dependent type>' where arithmetic or pointer type is
required
1 error generated.

which doesn't even include a line number.

clang 3.4 produces the correct error:
clang_warning_bug.c:5:17: error: use of undeclared identifier 'arst'
    x = (float) arst;
                ^
1 error generated.</pre>
        </div>
      </p>
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