import com.google.common.collect.Iterables
import com.google.common.collect.Multiset
import groovy.test.NotYetImplemented
import groovy.transform.Canonical
import org.gradle.api.tasks.Classpath
import org.gradle.api.tasks.CompileClasspath
import org.gradle.integtests.fixtures.AbstractHttpDependencyResolutionTest
import org.gradle.integtests.fixtures.ToBeFixedForConfigurationCache

Another example would be to reference a `SourceSet` to later get the source files, the compilation classpath or the outputs of the source set.
You should instead declare these as a `FileCollection` input and reference just that.

The same requirement applies to dependency management types with some nuances.

java.io.File wrapperProperties(java.io.File); private static java.io.File wrapperJar(); private static java.io.File gradleUserHome(org.gradle.cli.ParsedCommandLine); private static Logger logger(org.gradle.cli.ParsedCommandLine); } gradle-wrapper-classpath.properties projects=gradle-cli,gradle-wrapper-shared runtime= gradle-wrapper-parameter-names.properties org/gradle/cli/AbstractCommandLineC.class package org.gradle.cli; public abstract synchronized class AbstractCommandLineC implements CommandLineConverter...

        // the previous visit. It is important that this is NOT a heuristic
        // (it used to be) because if the filters are _equivalent_, we would
        // revisit all dependencies and possibly change the classpath order!
        boolean sameDependencies = dependencies(newResolutionFilter).equals(oldStates);
        if (sameDependencies) {

                    }
                }
            }
        """
        file("buildSrc/build.gradle") << """
            dependencies {
                classpath libs.lib
            }
        """

        when:
        fails ':help'

        then: "extension is not generated if there are no libraries defined"

The link:https://kotlinlang.org/docs/reference/compatibility.html[compatibility guarantees] provided by Kotlin apply for both backward and forward compatibility.

==== Backward compatibility

Method <org.gradle.plugins.ide.eclipse.model.EclipseModel.classpath(groovy.lang.Closure)> has arguments/return type groovy.lang.Closure that is not Gradle public API or primitive or built-in JDK classes or Kotlin classes in (EclipseModel.java:0)