More unapply changes

Author: odersky

compiler/src/dotty/tools/dotc/ast/Desugar.scala

@@ -39,7 +39,7 @@ object desugar {
    *  case class method that clashes with a user-defined method?
    */
   def isRetractableCaseClassMethodName(name: Name)(implicit ctx: Context): Boolean = name match {
-    case nme.apply | nme.unapply | nme.copy => true
+    case nme.apply | nme.unapply | nme.unapplySeq | nme.copy => true
     case DefaultGetterName(nme.copy, _) => true
     case _ => false
   }

compiler/src/dotty/tools/dotc/core/SymDenotations.scala

@@ -804,7 +804,7 @@ object SymDenotations {
 
     def isInlineMethod(implicit ctx: Context): Boolean =
       is(InlineMethod, butNot = AccessorOrSynthetic) &&
-      name != nme.unapply  // unapply methods do not count as inline methods
+      !name.isUnapplyName  // unapply methods do not count as inline methods
                            // we need an inline flag on them only do that
                            // reduceProjection gets access to their rhs
 

compiler/src/dotty/tools/dotc/printing/RefinedPrinter.scala

@@ -460,7 +460,7 @@ class RefinedPrinter(_ctx: Context) extends PlainPrinter(_ctx) {
         changePrec(OrPrec) { toText(trees, " | ") }
       case UnApply(fun, implicits, patterns) =>
         val extractor = fun match {
-          case Select(extractor, nme.unapply) => extractor
+          case Select(extractor, name) if name.isUnapplyName => extractor
           case _ => fun
         }
         toTextLocal(extractor) ~