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kotlinlang

Hi guys, 
While I was doing some tests with templates (ktor-html-builder) I faced a problem. I added negligently this function:
```
private fun BODY.pageheader() {
    TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
}

```
I just forgot to implement it. 

And then it took me some time to find my problem. The error is not logged anywhere. 

By the way, the api catches an exception (the error is not catched)