Noticed when developing a Kotlin Native program th...

# intellij

[napperley]

Noticed when developing a Kotlin Native program that IntelliJ doesn't show a warning popup when there is a Kotlin source file placed in a invalid location. For instance if the target is linux, the source set is main, and the Kotlin source file is located in linuxMain (instead of linuxMain/kotlin) then the source file is in a invalid location.