# Weird errors with return inside lambda
**URL:** https://discuss.kotlinlang.org/t/weird-errors-with-return-inside-lambda/1661
**Category:** Support
**Created:** [May 10, 2016, 6:11pm UTC](https://discuss.kotlinlang.org/t/weird-errors-with-return-inside-lambda/1661 "2016-05-10T18:11:37Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@dalewking](https://discuss.kotlinlang.org/u/dalewking)
#### Post date: [May 10, 2016, 6:11pm UTC](https://discuss.kotlinlang.org/t/weird-errors-with-return-inside-lambda/1661/1 "2016-05-10T18:11:37Z")
So in Kotlin 1.0 I was getting a runtime error on some code. Here is a stripped down version of my code that still demonstrates the problem:
private fun foo()
= File(“foo”).run()
{
return arrayOf(1, 2)
}
This failed at runtime saying it could not cast the array to java.lang.Void, but it gave a stack trace line number that did not exist so I had no idea where the actual error was.
To try to diagnose it I tried switching to 1.0.2 eap and it fails at compile time with:
```
'Nothing' return type needs to be specified explicitly
```
The line number is on the blank line before the function and the message was not very helpful but I was able to deduce that the error was due to the return statement. If I remove the return and just have the expression as the last line it works.
So I know the fix, just looking for some pointers to documentation on the thinking here regarding return statements inside of lambdas and is this a bug?
---
### Author:  [@Dittert](https://discuss.kotlinlang.org/u/Dittert)
#### Post date: [May 10, 2016, 8:27pm UTC](https://discuss.kotlinlang.org/t/weird-errors-with-return-inside-lambda/1661/2 "2016-05-10T20:27:12Z")
There’s something in the chapter about inline functions: [Non-local returns](https://kotlinlang.org/docs/reference/inline-functions.html#non-local-returns).
There are already an issue that might be related to this: [KT-10717](https://youtrack.jetbrains.com/issue/KT-10717). [KT-6295](https://youtrack.jetbrains.com/issue/KT-6295) is the change that required `Nothing` to be declared explicitely.