check private[this] members in override checking

src/compiler/scala/tools/nsc/transform/OverridingPairs.scala

@@ -37,7 +37,7 @@ abstract class OverridingPairs extends SymbolPairs {
      *  including bridges. But it may be refined in subclasses.
      */
     override protected def exclude(sym: Symbol) = (
-         sym.isPrivateLocal
+        (sym.isPrivateLocal && sym.isParamAccessor)
       || sym.isArtifact
       || sym.isConstructor
       || (sym.isPrivate && sym.owner != base) // Privates aren't inherited. Needed for pos/t7475a.scala

test/files/neg/t12349.check

@@ -33,6 +33,11 @@ def a8(): Unit (defined in class t12349a)
   override should be public
     protected[this]    override def a8(): Unit = println("Inner12349b#a8()") // weaker access privileges
                                     ^
+t12349b.scala:14: error: weaker access privileges in overriding
+def a9(): Unit (defined in class t12349a)
+  override should not be private
+      private[this]    override def a9(): Unit = println("Inner12349b#a9()") // weaker access privileges
+                                    ^
 t12349b.scala:18: error: weaker access privileges in overriding
 protected[package t12349] def b3(): Unit (defined in class t12349a)
   override should not be private
@@ -48,6 +53,11 @@ protected[package t12349] def b7(): Unit (defined in class t12349a)
   override should at least be protected[t12349]
       private[t12349]  override def b7(): Unit = println("Inner12349b#b7()") // weaker access privileges
                                     ^
+t12349b.scala:24: error: weaker access privileges in overriding
+protected[package t12349] def b9(): Unit (defined in class t12349a)
+  override should not be private
+      private[this]    override def b9(): Unit = println("Inner12349b#b9()") // weaker access privileges
+                                    ^
 t12349b.scala:27: error: weaker access privileges in overriding
 private[package t12349] def c2(): Unit (defined in class t12349a)
   override should at least be private[t12349]
@@ -73,6 +83,11 @@ private[package t12349] def c8(): Unit (defined in class t12349a)
   override should at least be private[t12349]
     protected[this]    override def c8(): Unit = println("Inner12349b#c8()") // weaker access privileges
                                     ^
+t12349b.scala:34: error: weaker access privileges in overriding
+private[package t12349] def c9(): Unit (defined in class t12349a)
+  override should not be private
+      private[this]    override def c9(): Unit = println("Inner12349b#c9()") // weaker access privileges
+                                    ^
 t12349b.scala:36: error: method d1 overrides nothing
                        override def d1(): Unit = println("Inner12349b#d1()") // overrides nothing
                                     ^
@@ -135,6 +150,11 @@ def a8(): Unit (defined in class t12349a)
   override should be public
       protected[this]    override def a8(): Unit = println("Inner12349c#a8()") // weaker access privileges
                                       ^
+t12349c.scala:18: error: weaker access privileges in overriding
+def a9(): Unit (defined in class t12349a)
+  override should not be private
+        private[this]    override def a9(): Unit = println("Inner12349c#a9()") // weaker access privileges
+                                      ^
 t12349c.scala:22: error: weaker access privileges in overriding
 protected[package t12349] def b3(): Unit (defined in class t12349a)
   override should not be private
@@ -150,6 +170,11 @@ protected[package t12349] def b7(): Unit (defined in class t12349a)
   override should at least be protected[t12349]
         private[pkg]     override def b7(): Unit = println("Inner12349c#b7()") // weaker access privileges
                                       ^
+t12349c.scala:28: error: weaker access privileges in overriding
+protected[package t12349] def b9(): Unit (defined in class t12349a)
+  override should not be private
+        private[this]    override def b9(): Unit = println("Inner12349c#b9()") // weaker access privileges
+                                      ^
 t12349c.scala:31: error: weaker access privileges in overriding
 private[package t12349] def c2(): Unit (defined in class t12349a)
   override should at least be private[t12349]
@@ -185,14 +210,14 @@ private[package t12349] def c8(): Unit (defined in class t12349a)
   override should at least be private[t12349]
       protected[this]    override def c8(): Unit = println("Inner12349c#c8()") // weaker access privileges
                                       ^
+t12349c.scala:38: error: weaker access privileges in overriding
+private[package t12349] def c9(): Unit (defined in class t12349a)
+  override should not be private
+        private[this]    override def c9(): Unit = println("Inner12349c#c9()") // overrides nothing (invisible)
+                                      ^
 t12349c.scala:30: error: method c1 overrides nothing
                          override def c1(): Unit = println("Inner12349c#c1()") // overrides nothing (invisible)
                                       ^
-t12349c.scala:38: error: method c9 overrides nothing.
-Note: the super classes of class Inner12349c contain the following, non final members named c9:
-private[package t12349] def c9(): Unit
-        private[this]    override def c9(): Unit = println("Inner12349c#c9()") // overrides nothing (invisible)
-                                      ^
 t12349c.scala:40: error: method d1 overrides nothing
                          override def d1(): Unit = println("Inner12349c#d1()") // overrides nothing
                                       ^
@@ -220,4 +245,4 @@ t12349c.scala:47: error: method d8 overrides nothing
 t12349c.scala:48: error: method d9 overrides nothing
         private[this]    override def d9(): Unit = println("Inner12349c#d9()") // overrides nothing
                                       ^
-52 errors
+57 errors

test/files/neg/t12349/t12349b.scala

@@ -11,7 +11,7 @@ object t12349b {
     protected[t12349]  override def a6(): Unit = println("Inner12349b#a6()") // weaker access privileges
       private[t12349]  override def a7(): Unit = println("Inner12349b#a7()") // weaker access privileges
     protected[this]    override def a8(): Unit = println("Inner12349b#a8()") // weaker access privileges
-      private[this]    override def a9(): Unit = println("Inner12349b#a9()") // [#9334]
+      private[this]    override def a9(): Unit = println("Inner12349b#a9()") // weaker access privileges
 
                        override def b1(): Unit = println("Inner12349b#b1()")
     protected          override def b2(): Unit = println("Inner12349b#b2()")
@@ -21,7 +21,7 @@ object t12349b {
     protected[t12349]  override def b6(): Unit = println("Inner12349b#b6()")
       private[t12349]  override def b7(): Unit = println("Inner12349b#b7()") // weaker access privileges
     protected[this]    override def b8(): Unit = println("Inner12349b#b8()") // [#12349] - not fixed by PR #9525
-      private[this]    override def b9(): Unit = println("Inner12349b#b9()") // [#9334]
+      private[this]    override def b9(): Unit = println("Inner12349b#b9()") // weaker access privileges
 
                        override def c1(): Unit = println("Inner12349b#c1()")
     protected          override def c2(): Unit = println("Inner12349b#c2()") // weaker access privileges
@@ -31,7 +31,7 @@ object t12349b {
     protected[t12349]  override def c6(): Unit = println("Inner12349b#c6()")
       private[t12349]  override def c7(): Unit = println("Inner12349b#c7()")
     protected[this]    override def c8(): Unit = println("Inner12349b#c8()") // weaker access privileges
-      private[this]    override def c9(): Unit = println("Inner12349b#c9()") // [#9334]
+      private[this]    override def c9(): Unit = println("Inner12349b#c9()") // weaker access privileges
 
                        override def d1(): Unit = println("Inner12349b#d1()") // overrides nothing
     protected          override def d2(): Unit = println("Inner12349b#d2()") // overrides nothing

test/files/neg/t12349/t12349c.scala

@@ -15,7 +15,7 @@ package pkg {
       protected[pkg]     override def a6(): Unit = println("Inner12349c#a6()") // weaker access privileges
         private[pkg]     override def a7(): Unit = println("Inner12349c#a7()") // weaker access privileges
       protected[this]    override def a8(): Unit = println("Inner12349c#a8()") // weaker access privileges
-        private[this]    override def a9(): Unit = println("Inner12349c#a9()") // [#9334]
+        private[this]    override def a9(): Unit = println("Inner12349c#a9()") // weaker access privileges
 
                          override def b1(): Unit = println("Inner12349c#b1()")
       protected          override def b2(): Unit = println("Inner12349c#b2()")
@@ -25,7 +25,7 @@ package pkg {
       protected[pkg]     override def b6(): Unit = println("Inner12349c#b6()")
         private[pkg]     override def b7(): Unit = println("Inner12349c#b7()") // weaker access privileges
       protected[this]    override def b8(): Unit = println("Inner12349c#b8()") // [#12349] - not fixed by PR #9525
-        private[this]    override def b9(): Unit = println("Inner12349c#b9()") // [#9334]
+        private[this]    override def b9(): Unit = println("Inner12349c#b9()") // weaker access privileges
 
                          override def c1(): Unit = println("Inner12349c#c1()") // overrides nothing (invisible)
       protected          override def c2(): Unit = println("Inner12349c#c2()") // weaker access privileges

test/files/neg/t4762.check

@@ -4,6 +4,10 @@ t4762.scala:17: warning: private[this] value x in class B shadows mutable x inhe
 t4762.scala:50: warning: private[this] value x in class Derived shadows mutable x inherited from class Base.  Changes to x will not be visible within class Derived - you may want to give them distinct names.
   class Derived( x : Int ) extends Base( x ) { override def toString = x.toString }
                                                                        ^
-error: No warnings can be incurred under -Werror.
+t4762.scala:13: error: weaker access privileges in overriding
+val y: Int (defined in class A)
+  override should not be private
+  private[this] def y: Int = 99
+                    ^
 2 warnings
 1 error

test/files/neg/t9334.check

@@ -0,0 +1,6 @@
+t9334.scala:5: error: weaker access privileges in overriding
+def aaa: Int (defined in class A)
+  override should not be private
+  private[this] def aaa: Int = 42
+                    ^
+1 error

test/files/neg/t9334.scala

@@ -0,0 +1,6 @@
+class A {
+  def aaa: Int = 10
+}
+class B extends A {
+  private[this] def aaa: Int = 42
+}