Merge pull request #8443 from xuwei-k/deprecated-scala-App

launcher-package/citest/Hello.scala

@@ -1,5 +1,7 @@
 package foo
 
-object Hello extends App {
-  println("hello")
+object Hello {
+  def main(args: Array[String]): Unit = {
+    println("hello")
+  }
 }

sbt-app/src/sbt-test/actions/input-task/Hello.scala

@@ -1,3 +1,5 @@
-object Hello extends App {
-  println("hello" + args.toList.toString)
+object Hello {
+  def main(args: Array[String]): Unit = {
+    println("hello" + args.toList.toString)
+  }
 }

sbt-app/src/sbt-test/classloader-cache/close-run/src/main/scala/Main.scala

@@ -1,10 +1,13 @@
-object Main extends App {
+object Main {
   class Foo
-  new Thread {
-    override def run(): Unit = {
-      Thread.sleep(500)
-      try new Foo
-      catch { case t: Throwable => sys.exit(1) }
-    }
-  }.start()
-}
+
+  def main(args: Array[String]): Unit = {
+    new Thread {
+      override def run(): Unit = {
+        Thread.sleep(500)
+        try new Foo
+        catch { case t: Throwable => sys.exit(1) }
+      }
+    }.start()
+  }
+}

sbt-app/src/sbt-test/compiler-project/separate-analysis-per-scala/foo.scala

@@ -1,6 +1,8 @@
 package foo
 
-object Foo extends App {
-  println("yay")
+object Foo {
+  def main(args: Array[String]): Unit = {
+    println("yay")
+  }
 }
 

sbt-app/src/sbt-test/dependency-management/aar-packaging/src/main/scala/Main.scala

@@ -1,6 +1,8 @@
 import java.io.File
 import java.nio.file.Files
 
-object Main extends App {
-  Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+object Main {
+  def main(args: Array[String]): Unit = {
+    Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/dependency-management/classifier2/src/main/scala/Main.scala

@@ -3,7 +3,7 @@ import java.nio.file.Files
 
 import scala.util.Try
 
-object Main extends App {
+object Main {
 
   def classFound(clsName: String) = Try(
     Thread.currentThread()
@@ -12,7 +12,10 @@ object Main extends App {
   ).toOption.nonEmpty
 
   val name = "org.jclouds.openstack.nova.functions.ParseServerFromJsonResponseTest"
-  val classifierTest = classFound(name)
 
-  assert(classifierTest, s"Couldn't find $name")
+  def main(args: Array[String]): Unit = {
+    val classifierTest = classFound(name)
+
+    assert(classifierTest, s"Couldn't find $name")
+  }
 }

sbt-app/src/sbt-test/dependency-management/exclude-dependencies2/src/main/scala/Main.scala

@@ -3,7 +3,7 @@ import java.nio.file.Files
 
 import scala.util.Try
 
-object Main extends App {
+object Main {
 
   def classFound(clsName: String) = Try(
     Thread.currentThread()
@@ -11,22 +11,24 @@ object Main extends App {
       .loadClass(clsName)
   ).toOption.nonEmpty
 
-  val shapelessFound = classFound("shapeless.HList")
-  val argonautFound = classFound("argonaut.Json")
-  val argonautShapelessFound = classFound("argonaut.derive.MkEncodeJson")
+  def main(args: Array[String]): Unit = {
+    val shapelessFound = classFound("shapeless.HList")
+    val argonautFound = classFound("argonaut.Json")
+    val argonautShapelessFound = classFound("argonaut.derive.MkEncodeJson")
 
-  assert(
-    argonautShapelessFound,
-    "Expected to find class from argonaut-shapeless"
-  )
-  assert(
-    !shapelessFound,
-    "Expected not to find classes from shapeless"
-  )
-  assert(
-    !argonautFound,
-    "Expected not to find classes from argonaut"
-  )
+    assert(
+      argonautShapelessFound,
+      "Expected to find class from argonaut-shapeless"
+    )
+    assert(
+      !shapelessFound,
+      "Expected not to find classes from shapeless"
+    )
+    assert(
+      !argonautFound,
+      "Expected not to find classes from argonaut"
+    )
 
-  Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+    Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/dependency-management/hadoop-yarn-server-resourcemanager/src/main/scala/Main.scala

@@ -3,6 +3,8 @@ import java.nio.file.Files
 
 import org.apache.zookeeper.ZooKeeper
 
-object Main extends App {
-  Files.write(new File("output").toPath, classOf[ZooKeeper].getSimpleName.getBytes("UTF-8"))
+object Main {
+  def main(args: Array[String]): Unit = {
+    Files.write(new File("output").toPath, classOf[ZooKeeper].getSimpleName.getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/dependency-management/inter-project/b/src/main/scala/Main.scala

@@ -3,11 +3,13 @@ import java.nio.file.Files
 
 import argonaut._, Argonaut._, ArgonautShapeless._
 
-object Main extends App {
+object Main {
 
   case class CC(i: Int, s: String)
 
-  val msg = CC(2, A.msg).asJson.spaces2
+  def main(args: Array[String]): Unit = {
+    val msg = CC(2, A.msg).asJson.spaces2
 
-  Files.write(new File("output").toPath, msg.getBytes("UTF-8"))
+    Files.write(new File("output").toPath, msg.getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/dependency-management/profiles/src/main/scala/Main.scala

@@ -1,19 +1,21 @@
 import java.io.File
 import java.nio.file.Files
 
-object Main extends App {
-  val p = new java.util.Properties
-  p.load(
-    Thread.currentThread()
-      .getContextClassLoader
-      .getResource("common-version-info.properties")
-      .openStream()
-  )
+object Main {
+  def main(args: Array[String]): Unit = {
+    val p = new java.util.Properties
+    p.load(
+      Thread.currentThread()
+        .getContextClassLoader
+        .getResource("common-version-info.properties")
+        .openStream()
+    )
 
-  val hadoopVersion = p.getProperty("version")
-  Console.err.println(s"Found hadoop version $hadoopVersion")
+    val hadoopVersion = p.getProperty("version")
+    Console.err.println(s"Found hadoop version $hadoopVersion")
 
-  assert(hadoopVersion == "2.6.0")
+    assert(hadoopVersion == "2.6.0")
 
-  Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+    Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/a/A.scala

@@ -9,8 +9,10 @@ package scala.collection.immutable {
 }
 
 
-object A extends App {
-  println(scala.util.Properties.versionString)
+object A {
+  def main(args: Array[String]): Unit = {
+    println(scala.util.Properties.versionString)
+  }
 }
 
 object AMacro {

sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/b/B.scala

@@ -1,7 +1,9 @@
 import java.nio.file.{Paths, Files}
 import java.nio.charset.StandardCharsets
 
-object B extends App {
-  println(AMacro.m(33)) // fails
-  Files.write(Paths.get(s"s${scala.util.Properties.versionNumberString}.txt"), "nix".getBytes)
+object B {
+  def main(args: Array[String]): Unit = {
+    println(AMacro.m(33)) // fails
+    Files.write(Paths.get(s"s${scala.util.Properties.versionNumberString}.txt"), "nix".getBytes)
+  }
 }

sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/c/C.scala

@@ -1,7 +1,9 @@
 import java.nio.file.{Paths, Files}
 import java.nio.charset.StandardCharsets
 
-object C extends App {
-  assert(scala.collection.immutable.Exp.v == null)
-  Files.write(Paths.get(s"s${scala.util.Properties.versionNumberString}.txt"), "nix".getBytes)
+object C {
+  def main(args: Array[String]): Unit = {
+    assert(scala.collection.immutable.Exp.v == null)
+    Files.write(Paths.get(s"s${scala.util.Properties.versionNumberString}.txt"), "nix".getBytes)
+  }
 }

sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze/a/A.scala

@@ -1,7 +1,9 @@
 import scala.language.reflectiveCalls
 
-object A extends App {
-  println(scala.util.Properties.versionString)
+object A {
+  def main(args: Array[String]): Unit = {
+    println(scala.util.Properties.versionString)
+  }
 }
 
 object AMacro {

sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze/b/B.scala

@@ -1,7 +1,9 @@
 import java.nio.file.{Paths, Files}
 import java.nio.charset.StandardCharsets
 
-object B extends App {
-  println(AMacro.m(33))
-  Files.write(Paths.get(s"s${scala.util.Properties.versionNumberString}.txt"), "nix".getBytes)
+object B {
+  def main(args: Array[String]): Unit = {
+    println(AMacro.m(33))
+    Files.write(Paths.get(s"s${scala.util.Properties.versionNumberString}.txt"), "nix".getBytes)
+  }
 }

sbt-app/src/sbt-test/dependency-management/url-no-head/src/main/scala/Main.scala

@@ -1,11 +1,13 @@
 import java.io.File
 import java.nio.file.Files
 
-object Main extends App {
+object Main {
   // Not using directly the NetLogo 5.x lib, which seems to depend on Scala 2.9
   // Can't find a way to check that NetLogo.jar is in the classpath
   // These don't work, even with fork := true:
   // assert(Thread.currentThread.getContextClassLoader.getResource("org/nlogo/nvm/Task.class") != null)
   // Thread.currentThread.getContextClassLoader.getResource("org/nlogo/nvm/Task.class")
-  Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+  def main(args: Array[String]): Unit = {
+    Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/java/cross/A.scala

@@ -3,14 +3,16 @@ package pkg
 import java.nio.file.{ Paths, Files }
 import java.nio.charset.Charset
 
-object A extends App {
-  val out = Paths.get("out.txt")
-  val content = sys.props("java.version")
-  val w = Files.newBufferedWriter(out, Charset.forName("UTF-8"))
-  try {
-    w.write(content)
-    w.flush()
-  } finally {
-    w.close
+object A {
+  def main(args: Array[String]): Unit = {
+    val out = Paths.get("out.txt")
+    val content = sys.props("java.version")
+    val w = Files.newBufferedWriter(out, Charset.forName("UTF-8"))
+    try {
+      w.write(content)
+      w.flush()
+    } finally {
+      w.close
+    }
   }
 }

sbt-app/src/sbt-test/lm-coursier/classifiers/src/main/scala/Main.scala

@@ -3,7 +3,7 @@ import java.nio.file.Files
 
 import scala.util.Try
 
-object Main extends App {
+object Main {
 
   def classFound(clsName: String) = Try(
     Thread.currentThread()
@@ -12,7 +12,10 @@ object Main extends App {
   ).toOption.nonEmpty
 
   val name = "org.jclouds.openstack.nova.functions.ParseServerFromJsonResponseTest"
-  val classifierTest = classFound(name)
 
-  assert(classifierTest, s"Couldn't find $name")
+  def main(args: Array[String]): Unit = {
+    val classifierTest = classFound(name)
+
+    assert(classifierTest, s"Couldn't find $name")
+  }
 }

sbt-app/src/sbt-test/lm-coursier/config-deps-resolution/src/main/scala/App.scala

@@ -1,6 +1,8 @@
 import ch.qos.logback.classic.BasicConfigurator
 import ch.qos.logback.classic.LoggerContext
 
-object GcMetricsApp extends App {
-  BasicConfigurator.configure(new LoggerContext())
+object GcMetricsApp {
+  def main(args: Array[String]): Unit = {
+    BasicConfigurator.configure(new LoggerContext())
+  }
 }

sbt-app/src/sbt-test/lm-coursier/credentials-from-file/src/main/scala/Main.scala

@@ -1 +1,3 @@
-object Main extends App
+object Main {
+  def main(args: Array[String]): Unit = ()
+}

sbt-app/src/sbt-test/lm-coursier/credentials-global/src/main/scala/Main.scala

@@ -1 +1,3 @@
-object Main extends App
+object Main {
+  def main(args: Array[String]): Unit = ()
+}

sbt-app/src/sbt-test/lm-coursier/credentials-sbt-global/src/main/scala/Main.scala

@@ -1 +1,3 @@
-object Main extends App
+object Main {
+  def main(args: Array[String]): Unit = ()
+}

sbt-app/src/sbt-test/lm-coursier/credentials-sbt/src/main/scala/Main.scala

@@ -1 +1,3 @@
-object Main extends App
+object Main {
+  def main(args: Array[String]): Unit = ()
+}

sbt-app/src/sbt-test/lm-coursier/from-no-head/src/main/scala/Main.scala

@@ -1,11 +1,13 @@
 import java.io.File
 import java.nio.file.Files
 
-object Main extends App {
+object Main {
   // Not using directly the NetLogo 5.x lib, which seems to depend on Scala 2.9
   // Can't find a way to check that NetLogo.jar is in the classpath
   // These don't work, even with fork := true:
   // assert(Thread.currentThread.getContextClassLoader.getResource("org/nlogo/nvm/Task.class") != null)
   // Thread.currentThread.getContextClassLoader.getResource("org/nlogo/nvm/Task.class")
-  Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+  def main(args: Array[String]): Unit = {
+    Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/lm-coursier/from-wrong-url/src/main/scala/Main.scala

@@ -3,11 +3,14 @@ import java.nio.file.Files
 
 import shapeless._
 
-object Main extends App {
+object Main {
   case class CC(s: String)
-  val cc = CC("OK")
-  val l = Generic[CC].to(cc)
-  val msg = l.head
 
-  Files.write(new File("output").toPath, msg.getBytes("UTF-8"))
+  def main(args: Array[String]): Unit = {
+    val cc = CC("OK")
+    val l = Generic[CC].to(cc)
+    val msg = l.head
+
+    Files.write(new File("output").toPath, msg.getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/lm-coursier/from/src/main/scala/Main.scala

@@ -3,11 +3,14 @@ import java.nio.file.Files
 
 import shapeless._
 
-object Main extends App {
+object Main {
   case class CC(s: String)
-  val cc = CC("OK")
-  val l = Generic[CC].to(cc)
-  val msg = l.head
 
-  Files.write(new File("output").toPath, msg.getBytes("UTF-8"))
+  def main(args: Array[String]): Unit = {
+    val cc = CC("OK")
+    val l = Generic[CC].to(cc)
+    val msg = l.head
+
+    Files.write(new File("output").toPath, msg.getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/lm-coursier/inter-project-resolvers/b/src/main/scala/Main.scala

@@ -1,9 +1,11 @@
 import java.io.File
 import java.nio.file.Files
 
-object Main extends App {
+object Main {
 
   // TODO Use some jvm-repr stuff as a test
 
-  Files.write(new File("output").toPath, A.default.msg.getBytes("UTF-8"))
+  def main(args: Array[String]): Unit = {
+    Files.write(new File("output").toPath, A.default.msg.getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/lm-coursier/inter-project-scala-tool/src/main/scala/Main.scala

@@ -8,6 +8,8 @@ import java.nio.file.Files
  *  @author A
  *  @param may not be `'''null'''`!!!
  */
-object Main extends App {
-  Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+object Main {
+  def main(args: Array[String]): Unit = {
+    Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/lm-coursier/maven-compatible/src/main/scala/Main.scala

@@ -1,9 +1,11 @@
 import java.io.File
 import java.nio.file.Files
 
-object Main extends App {
+object Main {
 
   // TODO Use some jvm-repr stuff
 
-  Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+  def main(args: Array[String]): Unit = {
+    Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/lm-coursier/maven-plugin-classpath-type/src/main/scala/Main.scala

@@ -1,6 +1,8 @@
 import java.io.File
 import java.nio.file.Files
 
-object Main extends App {
-  Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+object Main {
+  def main(args: Array[String]): Unit = {
+    Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/lm-coursier/neo-sbt-scalafmt/src/main/scala/Main.scala

@@ -1,6 +1,8 @@
 import java.io.File
 import java.nio.file.Files
 
-object Main extends App {
-  Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+object Main {
+  def main(args: Array[String]): Unit = {
+    Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/lm-coursier/scala-jars/src/main/scala/Main.scala

@@ -3,64 +3,66 @@ import java.nio.file.Files
 
 import scala.collection.JavaConverters._
 
-object Main extends App {
+object Main {
 
-  val cp = new collection.mutable.ArrayBuffer[File]
+  def main(args: Array[String]): Unit = {
+    val cp = new collection.mutable.ArrayBuffer[File]
 
-  def buildCp(loader: ClassLoader): Unit =
-    if (loader != null) {
-      loader match {
-        case u: java.net.URLClassLoader =>
-          cp ++= u.getURLs
-            .map(_.toURI)
-            .map(new File(_))
-        case _ =>
+    def buildCp(loader: ClassLoader): Unit =
+      if (loader != null) {
+        loader match {
+          case u: java.net.URLClassLoader =>
+            cp ++= u.getURLs
+              .map(_.toURI)
+              .map(new File(_))
+          case _ =>
+        }
+
+        buildCp(loader.getParent)
       }
 
-      buildCp(loader.getParent)
+    buildCp(Thread.currentThread().getContextClassLoader)
+
+    System.err.println("Classpath:")
+    for (f <- cp)
+      System.err.println(s"  $f")
+    System.err.println()
+
+    val sbtBase = new File(sys.props.getOrElse(
+      "sbt.global.base",
+      sys.props("user.home") + "/.sbt"
+    ))
+    val prefixes = Seq(new File(sbtBase, "boot").getAbsolutePath) ++
+      Seq("coursier.sbt-launcher.dirs.scala-jars", "coursier.sbt-launcher.dirs.base", "user.dir")
+        .flatMap(sys.props.get(_))
+        .map(new File(_).getAbsolutePath)
+    val home = new File(sys.props("user.home")).getAbsolutePath
+
+    def notFromCoursierCache(name: String): Unit = {
+      val jars = cp.filter(_.getName.startsWith(name)).distinct
+      assert(jars.nonEmpty, s"Found no JARs for $name")
+
+      for (jar <- jars)
+        assert(
+          !jar.getAbsolutePath.startsWith(home) ||
+            !jar.getAbsolutePath.toLowerCase(java.util.Locale.ROOT).contains("coursier") ||
+            prefixes.exists(jar.getAbsolutePath.startsWith),
+          s"JAR for $name ($jar) under $home and not under any of ${prefixes.mkString(", ")}"
+        )
     }
 
-  buildCp(Thread.currentThread().getContextClassLoader)
+    val props = Thread.currentThread()
+      .getContextClassLoader
+      .getResources("library.properties")
+      .asScala
+      .toVector
+      .map(_.toString)
+      .sorted
+      .distinct // TODO should not need distinct
 
-  System.err.println("Classpath:")
-  for (f <- cp)
-    System.err.println(s"  $f")
-  System.err.println()
+    notFromCoursierCache("scala-library")
+    assert(props.lengthCompare(1) == 0, s"Found several library.properties files in classpath: $props")
 
-  val sbtBase = new File(sys.props.getOrElse(
-    "sbt.global.base",
-    sys.props("user.home") + "/.sbt"
-  ))
-  val prefixes = Seq(new File(sbtBase, "boot").getAbsolutePath) ++
-    Seq("coursier.sbt-launcher.dirs.scala-jars", "coursier.sbt-launcher.dirs.base", "user.dir")
-      .flatMap(sys.props.get(_))
-      .map(new File(_).getAbsolutePath)
-  val home = new File(sys.props("user.home")).getAbsolutePath
-
-  def notFromCoursierCache(name: String): Unit = {
-    val jars = cp.filter(_.getName.startsWith(name)).distinct
-    assert(jars.nonEmpty, s"Found no JARs for $name")
-
-    for (jar <- jars)
-      assert(
-        !jar.getAbsolutePath.startsWith(home) ||
-          !jar.getAbsolutePath.toLowerCase(java.util.Locale.ROOT).contains("coursier") ||
-          prefixes.exists(jar.getAbsolutePath.startsWith),
-        s"JAR for $name ($jar) under $home and not under any of ${prefixes.mkString(", ")}"
-      )
+    Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
   }
-
-  val props = Thread.currentThread()
-    .getContextClassLoader
-    .getResources("library.properties")
-    .asScala
-    .toVector
-    .map(_.toString)
-    .sorted
-    .distinct // TODO should not need distinct
-
-  notFromCoursierCache("scala-library")
-  assert(props.lengthCompare(1) == 0, s"Found several library.properties files in classpath: $props")
-
-  Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
 }

sbt-app/src/sbt-test/lm-coursier/scala-sources-javadoc-jars/src/main/scala/Main.scala

@@ -1,6 +1,8 @@
 import java.io.File
 import java.nio.file.Files
 
-object Main extends App {
-  Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
-}
+object Main {
+  def main(args: Array[String]): Unit = {
+    Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+  }
+}

sbt-app/src/sbt-test/lm-coursier/simple/src/main/scala/Main.scala

@@ -1,6 +1,8 @@
 import java.io.File
 import java.nio.file.Files
 
-object Main extends App {
-  Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+object Main {
+  def main(args: Array[String]): Unit = {
+    Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/lm-coursier/zookeeper/src/main/scala/Main.scala

@@ -3,6 +3,8 @@ import java.nio.file.Files
 
 import org.apache.zookeeper.ZooKeeper
 
-object Main extends App {
-  Files.write(new File("output").toPath, classOf[ZooKeeper].getSimpleName.getBytes("UTF-8"))
+object Main {
+  def main(args: Array[String]): Unit = {
+    Files.write(new File("output").toPath, classOf[ZooKeeper].getSimpleName.getBytes("UTF-8"))
+  }
 }

sbt-app/src/sbt-test/plugins/hydra/Hello.scala

@@ -1,5 +1,7 @@
 package example
 
-object Hello extends App {
-  println("Hello!")
+object Hello {
+  def main(args: Array[String]): Unit = {
+    println("Hello!")
+  }
 }

sbt-app/src/sbt-test/project-matrix/java/app/src/main/scala/com/config/Main.scala

@@ -1,5 +1,7 @@
 package com.config
 
-object Main extends App {
+object Main {
+  def main(args: Array[String]): Unit = {
     println(s"Version: ${MyClass.configValue()}")
+  }
 }

sbt-app/src/sbt-test/project-matrix/jvm-with-scoping/app/src/main/scala/Main.scala

@@ -1,5 +1,7 @@
 package a
 
-object Main extends App {
-  val core = Core
+object Main {
+  def main(args: Array[String]): Unit = {
+    val core = Core
+  }
 }

sbt-app/src/sbt-test/project-matrix/lib/src/main/scala/Main.scala

@@ -1,3 +1,5 @@
-object Main extends App {
-  println(com.example.Lib.getMessage)
+object Main {
+  def main(args: Array[String]): Unit = {
+    println(com.example.Lib.getMessage)
+  }
 }

sbt-app/src/sbt-test/project-matrix/lib/ss/src/main/scala/Main.scala

@@ -1,3 +1,5 @@
-object Main extends App {
-  println(com.example.Lib.getMessage)
+object Main {
+  def main(args: Array[String]): Unit = {
+    println(com.example.Lib.getMessage)
+  }
 }

sbt-app/src/sbt-test/source-dependencies/backtick-quoted-names/B.scala

@@ -1,3 +1,5 @@
-object B extends App {
-   println(A.`=`)
+object B {
+  def main(args: Array[String]): Unit = {
+    println(A.`=`)
+  }
 }

sbt-app/src/sbt-test/source-dependencies/macro-annotation/core/src/main/scala/Test.scala

@@ -1,6 +1,8 @@
 @hello
 case class Test(x: Int)
 
-object Main extends App {
-  Test(3).hello
-}
+object Main {
+  def main(args: Array[String]): Unit = {
+    Test(3).hello
+  }
+}