Fix java enum flag

Previously the flag is not set properly

Author: liufengyun

compiler/src/dotty/tools/dotc/core/classfile/ClassfileConstants.scala

@@ -362,6 +362,7 @@ object ClassfileConstants {
       res = addFlag(res, nflags & JAVA_ACC_FINAL)
       res = addFlag(res, nflags & JAVA_ACC_SYNTHETIC)
       res = addFlag(res, nflags & JAVA_ACC_STATIC)
+      res = addFlag(res, nflags & JAVA_ACC_ENUM)
       res = addFlag(res, nflags & JAVA_ACC_ABSTRACT)
       res = addFlag(res, nflags & JAVA_ACC_INTERFACE)
       res

compiler/src/dotty/tools/dotc/transform/TypeTestsCasts.scala

@@ -59,10 +59,10 @@ object TypeTestsCasts {
 
     def replaceP(tp: Type)(implicit ctx: Context) = new TypeMap {
       def apply(tp: Type) = tp match {
-        case tref: TypeRef
-        if isPatternTypeSymbol(tref.typeSymbol) => WildcardType
-        case AnnotatedType(_, annot)
-        if annot.symbol == defn.UncheckedAnnot => WildcardType
+        case tref: TypeRef if tref.typeSymbol.isPatternBound =>
+          WildcardType(tref.underlying.bounds)
+        case AnnotatedType(_, annot) if annot.symbol == defn.UncheckedAnnot =>
+          WildcardType
         case _ => mapOver(tp)
       }
     }.apply(tp)
@@ -120,6 +120,9 @@ object TypeTestsCasts {
       maximizeType(P1, span, fromScala2x = false)
 
       val res = P1 <:< P
+
+      debug.println(TypeComparer.explained(P1 <:< P))
+
       debug.println("P1 : " + P1.show)
       debug.println("P1 <:< P = " + res)