Show environment info on main

build.sbt

@@ -10,8 +10,22 @@ lazy val root = project
     logLevel := Level.Warn,
     run / watchLogLevel := Level.Warn,
     test / watchLogLevel := Level.Warn,
-    Global / onChangedBuildSource := ReloadOnSourceChanges,
     test / watchBeforeCommand := Watch.clearScreen,
+    Global / onChangedBuildSource := ReloadOnSourceChanges,
+
+    scalacOptions ++= Seq(
+      "-unchecked",
+      "-explain",
+      "-Xprint-diff",
+      "-Xprint-diff-del",
+      "-Xprint-inline",
+      "-Ycheck-reentrant",
+      "-Ycook-comments",
+      "-Yprint-debug",
+      "-Yprint-pos-syms",
+      "-Yprint-debug-owners",
+      "-Yshow-var-bounds",
+    ),
 
     libraryDependencies += "org.scalameta" %% "munit" % "0.7.29" % Test,
 

src/main/scala/Main.scala

@@ -1,5 +1,15 @@
+import scala.util.Properties
+
 @main def hello: Unit =
-  val a_char = ','
-  val immutable = "Scala"
-  var mutable = "lo"
-  println(s"Hel${mutable}es$a_char $immutable!")
+  println(s"Scala Library version ${Properties.versionNumberString}")
+  println(s"Development version: " +
+    s"${Properties.developmentVersion.getOrElse("N/A")} " +
+    s"Release version: ${Properties.releaseVersion.getOrElse("N/A")}"
+  )
+  println(
+    s"${Properties.javaVmVendor} " +
+    s"${Properties.javaVmName} " +
+    s"${Properties.javaVmVersion} " +
+    s"(${Properties.javaVmInfo})"
+  )
+  println(s"JDK Home: ${Properties.jdkHome}")