import org.gradle.api.logging.LoggingManager
import org.gradle.api.plugins.PluginAware
import org.gradle.kotlin.dsl.ScriptHandlerScope
import org.gradle.kotlin.dsl.PluginDependenciesSpecScope
import org.gradle.plugin.use.PluginDependenciesSpec


@ImplicitReceiver(Project::class)
open class CompiledKotlinBuildScript(
    private val host: KotlinScriptHost<Project>

                    nestedPluginC,
                    // plugins with ids prefixed by other plugin ids
                    // cannot be properly supported due to the side-effecting nature
                    // of `PluginDependenciesSpec#id`
                    PluginTree.PluginSpec("flat-plugin.conflict", "IgnoredPlugin"),
                    PluginTree.PluginSpec("nested.plugin-a.conflict", "IgnoredPlugin")
                ).shuffled().asSequence()

Gradle determines the correct `this` object and invokes the correct corresponding method.
The `this` of the method invocation `id("plugin")` object is of type link:{javadocPath}/org/gradle/plugin/use/PluginDependenciesSpec.html[`PluginDependenciesSpec`].

The settings file is composed of Gradle API calls built on top of the DSLs.
Gradle executes the script line by line, top to bottom.

Let's take a look at an example and break it down:

import javax.annotation.Nullable;

/**
 * A mutable specification of a dependency on a plugin.
 * <p>
 * Can be used to specify the version of the plugin to use.
 * </p>
 * <p>
 * See {@link PluginDependenciesSpec} for more information about declaring plugin dependencies.
 * </p>
 */
public interface PluginDependencySpec {

    /**
     * Specify the version of the plugin to depend on.
     *
     * <pre>