Merge pull request scala#2189 from adriaanm/ticket-7195

[nomaster] SI-7195 minor version mustn't introduce warnings

Author: JamesIry

src/compiler/scala/tools/nsc/typechecker/Typers.scala

@@ -1823,7 +1823,9 @@ trait Typers extends Modes with Adaptations with Tags {
 
         def pkgObjectWarning(m : Symbol, mdef : ModuleDef, restricted : String) = {
           val pkgName = mdef.symbol.ownerChain find (_.isPackage) map (_.decodedName) getOrElse mdef.symbol.toString
-          context.warning(if (m.pos.isDefined) m.pos else mdef.pos, s"${m} should be placed directly in package ${pkgName} instead of package object ${pkgName}. Under some circumstances companion objects and case classes in package objects can fail to recompile. See https://issues.scala-lang.org/browse/SI-5954.")
+          val pos = if (m.pos.isDefined) m.pos else mdef.pos
+          debugwarn(s"${m}  should be placed directly in package ${pkgName} instead of package object ${pkgName}. Under some circumstances companion objects and case classes in package objects can fail to recompile. See https://issues.scala-lang.org/browse/SI-5954.")
+          debugwarn(pos.lineContent + (if (pos.isDefined) " " * (pos.column - 1) + "^" else ""))
         }
       }