Is this a known bug?

# announcements

[Chris]

Is this a known bug?

[karelpeeters]

I don't mean no be snarky but are you sure that they're the same string? Does Ctrl+Shift+B (go to type definition) get you the same one on both?

[Chris]

@karelpeeters both jump me to the same location, class kotlin.String in kotlin.kotlin_builtins

[streetsofboston]

What are the definitions of the two fileExtension functions?

[Chris]

it seems to be happening for delegated properties

[karelpeeters]

And is it possible to create a mininal example?

[Chris]

image.png

[Chris]

val ScriptCompilationConfigurationKeys.fileExtension by PropertiesCollection.key<String>("kts")
val ScriptEvaluationConfigurationKeys.hostConfiguration by PropertiesCollection.key<ScriptingHostConfiguration>()
val ScriptCompilationConfigurationKeys.displayName by PropertiesCollection.key<String>("Kotlin script")

[streetsofboston]

What is the type of fileExtension?

[Chris]

(for reference, I've checked out the 1.3.41 release of Kotlin)

[Chris]

image.png

[Chris]

that's where I'm seeing these errors

[streetsofboston]

How is PropertiesCollection.Key<T> defined?

[Chris]

class PropertyKeyDelegate<T>(private val getDefaultValue: PropertiesCollection.() -> T?) {
        constructor(defaultValue: T?) : this({ defaultValue })

        operator fun getValue(thisRef: Any?, property: KProperty<*>): Key<T> =
            Key(property.name, getDefaultValue)
    }

[streetsofboston]

That is the delegate of a PropertiesCollection.Key<T>. How is PropertiesCollection.Key<T> itself defined?

[karelpeeters]

Just create a pastebin somewhere with the full code that we can run.

[Chris]

https://github.com/JetBrains/kotlin/blob/v1.3.41/libraries/scripting/common/src/kotlin/script/experimental/util/propertiesCollection.kt#L16

[Chris]

This is the definition of Key itself

[Chris]

and on line 78 you have the invoke function which is what's called in my original screenshot

[streetsofboston]

There are a loooooot of overloaded invoke functions there! Did you try it with an older kotlin version. The one in 1.3.41 has a newer type-inference engine… maybe that is messing up.

It could be that the IDE is complaining, but compilation may be successful.

[Chris]

thanks for the help, I've just created an issue on YouTrack

[karelpeeters]

Link?