<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/66473>66473</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            MLIR: error: Missing `cppType` field in Attribute/Type parameter: AnyPattern
        </td>
    </tr>

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

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

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

<pre>
    I ran into this error in my toy compiler. Flang has this pattern of:
```cpp
def IsFortranVariablePred
        : CPred<"::hlfir::isFortranVariableType($_self)">;
def AnyFortranVariable : Type<IsFortranVariablePred, "any HLFIR variable type">;
```
Predicate + Type = AnyType

https://github.com/llvm/llvm-project/blob/main/flang/include/flang/Optimizer/HLFIR/HLFIROpBase.td

I tried the same pattern :-)

```cpp
def IsPatternPred
    : CPred<"isPattern($_self)">;
def AnyPattern: Type<IsPatternPred, "any pattern">;
```

But I get an error: ` error: Missing `cppType` field in Attribute/Type parameter: AnyPattern`.

Any ideas?

The error message was introduced in https://github.com/llvm/llvm-project/commit/5f1a388a11ae67c2e5d7a4d1fe45e369a393c572
</pre>
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