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kotlinlang

While developing a custom plugin for kotlin, I have found a problem that, I can't get the *typeReference* when writing *Single-expression functions*.
The code block is given below.
```val element: KtNamedFunction =//from another FUN
if(element.typeReference!= null){
   if (it.text != "Unit") {
        print(return type)
   }
} ```
*Sample function 1*
```fun abc():Int{
    return 0
}```
*Sample function 2*
```fun abcd()=0```
When executing the first function I am getting `Int` as the typeReference. But when executing the second, I am getting `null` as typeReference.

*Why I am getting `null` when using Single-expression functions? How to solve it?*