KotlinClosure1 and similar can not specify null recivier

[JLLeitschuh]

Expected Behavior

Should be able to define a KotlinClosure1 like this:

KotlinClosure1<Exception?, Unit> ({
    // Do something
}

Current Behavior

Compiler error:

MessageBroker.gradle.kts:46:30: Type argument is not within its bounds: should be subtype of 'Any'

Your Environment

------------------------------------------------------------
Gradle 4.3.1
------------------------------------------------------------

Build time:   2017-11-08 08:59:45 UTC
Revision:     e4f4804807ef7c2829da51877861ff06e07e006d

Groovy:       2.4.12
Ant:          Apache Ant(TM) version 1.9.6 compiled on June 29 2015
JVM:          1.8.0_92 (Oracle Corporation 25.92-b14)
OS:           Mac OS X 10.12.6 x86_64

[JLLeitschuh]

This should fix the problem, changing in T : Any to in T : Any?.

class KotlinClosure1<in T : Any?, V : Any>(
    val function: T.() -> V?,
    owner: Any? = null,
    thisObject: Any? = null) : groovy.lang.Closure<V?>(owner, thisObject) {

    @Suppress("unused") // to be called dynamically by Groovy
    fun doCall(it: T): V? = it.function()
}

[JLLeitschuh]

While this problem is being solved, V should also be nullable as well.

[JLLeitschuh]

V seems to be handled as it is.

Side Note
I was kind of confused why this even compiled in Kotlin:

class KotlinClosure1<in T : Any, V : Any>(val function: T.() -> V?)
fun closure(function: String?.() -> String?) = KotlinClosure1(function)

Then I realized that it actually became:

fun closure(function: String?.() -> String?) = KotlinClosure1<String, String>(function)

PR will be forthcoming to fix this issue.

[bamboo]

Fixed in #594.