one fewer warning: can't currently distinguish getter and setter in unused defs in traits

Author: adriaanm

src/reflect/scala/reflect/internal/Symbols.scala

@@ -98,8 +98,9 @@ trait Symbols extends api.Symbols { self: SymbolTable =>
     def isJava: Boolean = isJavaDefined
 
     def isField: Boolean = isTerm && !isModule && (!isMethod || owner.isTrait && isAccessor)
-    def isVal: Boolean = isField && !isMutable
-    def isVar: Boolean = isField && !isLazy && isMutable
+    def isMutableVal = if (owner.isTrait) !hasFlag(STABLE) else isMutable
+    def isVal: Boolean = isField && !isMutableVal
+    def isVar: Boolean = isField && !isLazy && isMutableVal
 
     def isAbstract: Boolean = isAbstractClass || isDeferred || isAbstractType
     def isPrivateThis = (this hasFlag PRIVATE) && (this hasFlag LOCAL)

test/files/neg/warn-unused-privates.check

@@ -16,16 +16,13 @@ warn-unused-privates.scala:14: warning: private val in object Bippy is never use
 warn-unused-privates.scala:36: warning: private val in class Boppy is never used
   private val hummer = "def" // warn
               ^
-warn-unused-privates.scala:43: warning: private method in trait Accessors is never used
+warn-unused-privates.scala:43: warning: private var in trait Accessors is never used
   private var v1: Int = 0 // warn
               ^
-warn-unused-privates.scala:43: warning: private setter in trait Accessors is never used
-  private var v1: Int = 0 // warn
-              ^
-warn-unused-privates.scala:44: warning: private setter in trait Accessors is never used
+warn-unused-privates.scala:44: warning: private var in trait Accessors is never used
   private var v2: Int = 0 // warn, never set
               ^
-warn-unused-privates.scala:45: warning: private method in trait Accessors is never used
+warn-unused-privates.scala:45: warning: private var in trait Accessors is never used
   private var v3: Int = 0 // warn, never got
               ^
 warn-unused-privates.scala:57: warning: private default argument in trait DefaultArgs is never used
@@ -65,5 +62,5 @@ warn-unused-privates.scala:103: warning: local type OtherThing is never used
     type OtherThing = String // warn
          ^
 error: No warnings can be incurred under -Xfatal-warnings.
-22 warnings found
+21 warnings found
 one error found