---
title: "illegalDecoyCallException"
description: "Used with decoys to stub the body of the decoy function. Any call to this function at runtime
indicates compiler error, as all calls to decoys should be compiled out."
type: "function"
---

<div class='type'>Function</div>


<a id='references'></a>
<div class='sourceset sourceset-common'>Common</div>


```kotlin
@ComposeCompilerApi
public fun illegalDecoyCallException(fName: String): Nothing
```


Used with decoys to stub the body of the decoy function. Any call to this function at runtime
indicates compiler error, as all calls to decoys should be compiled out.