tasks.regiser<T>(name) returns NamedDomainObjectProvider instead of TaskProvider

[JLLeitschuh]

This is the example code I'm working from:

val sourceJar =
    tasks.register<Jar>("sourceJar") {
        group = LifecycleBasePlugin.BUILD_GROUP
        description = "An archive of the source code"
        classifier = "sources"
        from(java.sourceSets["main"].allSource)
    }

Expected Behavior

sourceJar in the example should be of type TaskProvider<Jar>

Current Behavior

sourceJar in the example above should not return the less specific typeNamedDomainObjectProvider<Jar>

Context

With the addition of the TaskProvider API, I'm concerned that future API's will constrain the inputs of lazy task's to only accept TaskProvider which will prevent objects created through tasks.register to be passed without casting.

Your Environment

------------------------------------------------------------
Gradle 4.10
------------------------------------------------------------

Build time:   2018-08-27 18:35:06 UTC
Revision:     ee3751ed9f2034effc1f0072c2b2ee74b5dce67d

Kotlin DSL:   1.0-rc-3
Kotlin:       1.2.60
Groovy:       2.4.15
Ant:          Apache Ant(TM) version 1.9.11 compiled on March 23 2018
JVM:          1.8.0_92 (Oracle Corporation 25.92-b14)
OS:           Mac OS X 10.13.6 x86_64

[StefMa]

Is that a issue for the Kotlin DSL?
You simply call this method which is a API call from gradle/gradle, no? 🤔

Anyway. The following buildscript gives the correct output:

plugins {
  java
}

val sourceJar =
    tasks.register<Jar>("sourceJar") {
        group = LifecycleBasePlugin.BUILD_GROUP
        description = "An archive of the source code"
        classifier = "sources"
        from(sourceSets["main"].allSource)
    }

println(sourceJar)
println(sourceJar is TaskProvider<Jar>)

(with Gradle 4.10.1):

> Configure project :
provider(task sourceJar, class org.gradle.api.tasks.bundling.Jar)
true

[JLLeitschuh]

It's because there's a reified extension function, but not one for TaskContainer.

The runtime type is correct, but the compile time type is not.

[eskatos]

Closing as fixed in #1116