Fix += on sourceGenerators

main-settings/src/main/scala/sbt/Def.scala

@@ -319,7 +319,7 @@ object Def extends Init[Scope] with TaskMacroExtra with InitializeImplicits:
     inline def value: A1 = InputWrapper.`wrapInitTask_\u2603\u2603`[A1](in)
 
     /**
-     * This treats the `Initailize[Task[A]]` as a setting that returns the Task value,
+     * This treats the `Initialize[Task[A]]` as a setting that returns the Task value,
      * instead of evaluating the task.
      */
     inline def taskValue: Task[A1] = InputWrapper.`wrapInit_\u2603\u2603`[Task[A1]](in)

main-settings/src/main/scala/sbt/Structure.scala

@@ -82,7 +82,7 @@ sealed abstract class SettingKey[A1]
   final inline def :=(inline v: A1): Setting[A1] =
     ${ TaskMacro.settingAssignMacroImpl('this, 'v) }
 
-  final inline def +=[A2](inline v: A2)(using Append.Value[A1, A2]): Setting[A1] =
+  final inline def +=[A2](inline v: A2)(using inline ev: Append.Value[A1, A2]): Setting[A1] =
     ${ TaskMacro.settingAppend1Impl[A1, A2]('this, 'v) }
 
   final inline def append1[A2](v: Initialize[A2])(using

main-settings/src/main/scala/sbt/std/TaskMacro.scala

@@ -93,7 +93,7 @@ object TaskMacro:
         '{
           InputWrapper.`wrapInitTask_\u2603\u2603`[Option[A1]](Previous.runtime[A1]($t)($ev))
         }
-      case _ => report.errorAndAbort(s"JsonFormat[${Type.of[A1]}] missing")
+      case _ => report.errorAndAbort(s"JsonFormat[${Type.show[A1]}] missing")
 
   /** Implementation of := macro for settings. */
   def settingAssignMacroImpl[A1: Type](rec: Expr[Scoped.DefinableSetting[A1]], v: Expr[A1])(using
@@ -147,7 +147,7 @@ object TaskMacro:
               $rec.+=($v2.taskValue)(using $ev)
             }
           case _ =>
-            report.errorAndAbort(s"Append.Value[${Type.of[A1]}, ${Type.of[Task[a]]}] missing")
+            report.errorAndAbort(s"Append.Value[${Type.show[A1]}, ${Type.show[Task[a]]}] missing")
       case _ =>
         Expr.summon[Append.Value[A1, A2]] match
           case Some(ev) =>
@@ -155,7 +155,8 @@ object TaskMacro:
             '{
               $rec.append1[A2]($init)(using $ev)
             }
-          case _ => report.errorAndAbort(s"Append.Value[${Type.of[A1]}, ${Type.of[A2]}] missing")
+          case _ =>
+            report.errorAndAbort(s"Append.Value[${Type.show[A1]}, ${Type.show[A2]}] missing")
 
   /*
   private[this] def transformMacroImpl[A](using qctx: Quotes)(init: Expr[A])(

sbt-app/src/sbt-test/actions/clean-managed/build.sbt

@@ -1,5 +1,7 @@
 import sbt.nio.file.Glob
 
+name := "clean-managed"
+scalaVersion := "3.3.1"
 Compile / sourceGenerators += {
   Def.task {
     val files = Seq(sourceManaged.value / "foo.txt", sourceManaged.value / "bar.txt")

sbt-app/src/sbt-test/actions/clean-managed/pending

@@ -1,6 +0,0 @@
-> compile
-$ exists target/scala-2.12/src_managed/foo.txt target/scala-2.12/src_managed/bar.txt
-
-> clean
-$ absent target/scala-2.12/src_managed/foo.txt
-$ exists target/scala-2.12/src_managed/bar.txt

sbt-app/src/sbt-test/actions/clean-managed/test

@@ -0,0 +1,6 @@
+> compile
+$ exists target/out/jvm/scala-3.3.1/clean-managed/src_managed/foo.txt target/out/jvm/scala-3.3.1/clean-managed/src_managed/bar.txt
+
+> clean
+$ absent target/out/jvm/scala-3.3.1/clean-managed/src_managed/foo.txt
+$ exists target/out/jvm/scala-3.3.1/clean-managed/src_managed/bar.txt

sbt-app/src/sbt-test/actions/generator/build.sbt

@@ -10,5 +10,5 @@ lazy val root = (project in file("."))
       file :: Nil
     },
     Compile / sourceGenerators += buildInfo,
-    Compile / sourceGenerators += Def.task { Nil },
+    Compile / sourceGenerators += Def.task { Seq.empty[File] },
   )

sbt-app/src/sbt-test/actions/generator/pending

@@ -1,2 +0,0 @@
-> compile
-$ exists target/scala-2.12/src_managed/BuildInfo.scala

sbt-app/src/sbt-test/actions/generator/test

@@ -0,0 +1,2 @@
+> compile
+$ exists target/out/jvm/scala-2.12.12/root/src_managed/BuildInfo.scala