Kill project delegation

main/src/main/scala/sbt/Project.scala

@@ -49,15 +49,12 @@ sealed trait ProjectDefinition[PR <: ProjectReference] {
    */
   def aggregate: Seq[PR]
 
-  @deprecated("Delegation between projects should be replaced by directly sharing settings.", "0.13.0")
-  def delegates: Seq[PR]
-
   /** The references to projects that are classpath dependencies of this project. */
   def dependencies: Seq[ClasspathDep[PR]]
 
   /** The references to projects that are aggregate and classpath dependencies of this project. */
   def uses: Seq[PR] = aggregate ++ dependencies.map(_.project)
-  def referenced: Seq[PR] = delegates ++ uses
+  def referenced: Seq[PR] = uses
 
   /**
    * The defined [[Plugins]] associated with this project.
@@ -169,9 +166,6 @@ sealed trait Project extends ProjectDefinition[ProjectReference] {
       Eval.later { deps } map { ds1 => ds0 ++ ds1 }
     })
 
-  // @deprecated("Delegation between projects should be replaced by directly sharing settings.", "0.13.0")
-  // def delegateTo(from: ProjectReference*): Project = copy(delegates = delegates ++ from)
-
   /**
    * Adds projects to be aggregated.  When a user requests a task to run on this project from the command line,
    * the task will also be run in aggregated projects.

main/src/main/scala/sbt/internal/BuildUtil.scala

@@ -68,7 +68,6 @@ object BuildUtil {
     // check for cycles
     for ((_, lbu) <- units; proj <- lbu.defined.values) {
       deps(proj)(_.dependencies.map(_.project))
-      deps(proj)(_.delegates)
       deps(proj)(_.aggregate)
     }
   }

main/src/main/scala/sbt/internal/Load.scala

@@ -149,8 +149,10 @@ private[sbt] object Load {
   def configInheritRef(lb: LoadedBuild, ref: ProjectRef, config: ConfigKey): Seq[ConfigKey] =
     configurationOpt(lb.units, ref.build, ref.project, config).toList.flatMap(_.extendsConfigs).map(c => ConfigKey(c.name))
 
-  def projectInherit(lb: LoadedBuild, ref: ProjectRef): Seq[ProjectRef] =
-    getProject(lb.units, ref.build, ref.project).delegates
+  def projectInherit(lb: LoadedBuild, ref: ProjectRef): Seq[ProjectRef] = {
+    val _ = getProject(lb.units, ref.build, ref.project)
+    Nil
+  }
 
   // build, load, and evaluate all units.
   //  1) Compile all plugin definitions