<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/185003>185003</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Why does opt produce "unknown module pass 'xxx'" in case of default<O3>?
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          pmor13
      </td>
    </tr>
</table>

<pre>
    If I run:

```
opt -S --load-pass-plugin=yyy.so -passes="xxx" < foo.ll
```

then opt produces:

```
<nothing>
```
which is expected (pass 'xxx' is found and executed).

If I run:

```
opt -S --load-pass-plugin=yyy.so -passes="xxx" -O3 < foo.ll
```

then opt produces:

```
Cannot specify -O# and --passes=/--foo-pass, use -passes='default<O#>,other-pass'
```

If I run:

```
opt -S --load-pass-plugin=yyy.so -passes="default<O3>,xxx" < foo.ll
```

then opt produces:

```
opt: unknown module pass 'xxx'
```

Why? How to execute module pass 'xxx' together with all passes in -O3?
</pre>
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