def % support

main/src/main/scala/sbt/ProjectExtra.scala

@@ -53,6 +53,7 @@ import sbt.internal.server.ServerHandler
 import sbt.librarymanagement.Configuration
 import sbt.util.{ Show, Level }
 import sjsonnew.JsonFormat
+import scala.annotation.targetName
 import scala.concurrent.{ Await, TimeoutException }
 import scala.concurrent.duration.*
 
@@ -222,17 +223,6 @@ trait ProjectExtra extends Scoped.Syntax:
         keyNameColor
       )
 
-    /*
-
-
-
-  final class Constructor(p: ProjectReference) {
-    def %(conf: Configuration): ClasspathDependency = %(conf.name)
-
-    def %(conf: String): ClasspathDependency = ClasspathDependency(p, Some(conf))
-  }
-     */
-
     def getOrError[T](state: State, key: AttributeKey[T], msg: String): T =
       state.get(key).getOrElse(sys.error(msg))
 
@@ -670,6 +660,12 @@ trait ProjectExtra extends Scoped.Syntax:
   ): Conversion[A, ClasspathDep[ProjectReference]] =
     (a: A) => ClasspathDep.ClasspathDependency(a, None)
 
+  extension (p: ProjectReference)
+    def %(conf: Configuration): ClasspathDep.ClasspathDependency = %(conf.name)
+    @targetName("percentString")
+    def %(conf: String): ClasspathDep.ClasspathDependency =
+      ClasspathDep.ClasspathDependency(p, Some(conf))
+
   extension [A1](in: Def.Initialize[Task[A1]])
     def updateState(f: (State, A1) => State): Def.Initialize[Task[A1]] =
       in(t => SessionVar.transform(t, f))