support varargs and fields

src/compiler/scala/tools/nsc/tasty/TreeUnpickler.scala

@@ -1189,7 +1189,7 @@ class TreeUnpickler[Tasty <: TastyUniverse](
               // wrong number of arguments in some scenarios reading F-bounded
               // types. This came up in #137 of collection strawman.
               tpd.AppliedTypeTree(readTpt(), until(end)(readTpt()), isJava)
-            case ANNOTATEDtpt => tpd.Annotated(readTpt(), readTerm()(ctx.addMode(ReadAnnotTopLevel)))
+            case ANNOTATEDtpt => tpd.Annotated(readTpt(), readTerm()(ctx.addMode(ReadAnnotTopLevel)), isJava)
             case LAMBDAtpt => tpd.LambdaTypeTree(readParams[NoCycle](TYPEPARAM).map(symFromNoCycle), readTpt())
             case MATCHtpt => matchTypeIsUnsupported
             case TYPEBOUNDStpt =>

src/compiler/scala/tools/nsc/tasty/bridge/ContextOps.scala

@@ -474,7 +474,7 @@ trait ContextOps { self: TastyUniverse =>
       else if (name === TastyName.MixinConstructor) {
         owner.newMethodSymbol(u.nme.MIXIN_CONSTRUCTOR, u.NoPosition, newSymbolFlagSet(flags &~ Stable, isJava))
       }
-      else if (isJava && flags.is(FlagSets.JavaEnumCase)) {
+      else if (isJava && flags.not(Method)) {
         owner.newValue(encodeTermName(name), u.NoPosition, newSymbolFlagSet(flags, isJava))
       }
       else {

src/compiler/scala/tools/nsc/tasty/bridge/TreeOps.scala

@@ -161,16 +161,21 @@ trait TreeOps { self: TastyUniverse =>
     def AppliedTypeTree(tpt: Tree, args: List[Tree], isJava: Boolean)(implicit ctx: Context): Tree = {
       if (tpt.tpe === AndTpe) {
         u.CompoundTypeTree(u.Template(args, u.noSelfType, Nil)).setType(u.intersectionType(args.map(_.tpe)))
-      } else {
+      }
+      else if (isJava && u.definitions.isScalaRepeatedParamType(tpt.tpe)) {
+        u.AppliedTypeTree(tpt, args).setType(u.definitions.javaRepeatedType(args.head.tpe))
+      }
+      else {
         u.AppliedTypeTree(tpt, args).setType(defn.AppliedType(tpt.tpe, args.map(_.tpe), isJava))
       }
     }
 
-    def Annotated(tpt: Tree, annot: Tree)(implicit ctx: Context): Tree = {
+    def Annotated(tpt: Tree, annot: Tree, isJava: Boolean)(implicit ctx: Context): Tree = {
       if (annot.tpe.typeSymbol === defn.RepeatedAnnot
           && tpt.tpe.typeSymbol.isSubClass(u.definitions.SeqClass)
           && tpt.tpe.typeArgs.length == 1) {
-        tpd.TypeTree(u.definitions.scalaRepeatedType(tpt.tpe.typeArgs.head))
+        if (isJava) tpd.TypeTree(u.definitions.javaRepeatedType(tpt.tpe.typeArgs.head))
+        else tpd.TypeTree(u.definitions.scalaRepeatedType(tpt.tpe.typeArgs.head))
       }
       else {
         u.Annotated(annot, tpt).setType(defn.AnnotatedType(tpt.tpe, annot))

test/tasty/run-pipelined/src-2/tastytest/TestObjectTpeJava.scala

@@ -0,0 +1,37 @@
+package tastytest
+
+import lib.ObjectTpeJava
+import scala.annotation.nowarn
+
+// keep in sync with ObjectTpeJava.java
+object TestObjectTpeJava extends scala.App {
+
+  val newOTJ = new ObjectTpeJava
+
+  val newOTJInner = new ObjectTpeJava.Inner[Int](23, true)
+
+  newOTJ.meth1(1) // OK
+  newOTJ.meth2(1) // OK
+  newOTJ.meth3(List[Int](1)) // OK
+  newOTJ.meth4(List[Int](1)) // OK
+  newOTJ.meth5(Array[Object]("abc")) // OK
+  newOTJ.meth6(Array[String]("abc")) // Ok
+  // newOTJ.meth5(Array[Int](1)) // error: Array[Int] is not a subtype of Array[Object]
+  // newOTJ.meth6(Array[Int](1)) // error: Array[Int] is not a subtype of Array[T & Object]
+  newOTJ.meth7(1) // OK (creates a reference array)
+  newOTJ.meth8(1) // OK (creates a primitive array and copies it into a reference array at Erasure)
+  val li = Array[Int](1)
+  newOTJ.meth7(li: _*) // OK (will copy the array at Erasure)
+  newOTJ.meth8(li: _*) // OK (will copy the array at Erasure)
+
+  newOTJInner.meth1(1) // OK
+  newOTJInner.meth2(1) // OK
+
+  assert((newOTJInner.field1: Int) == 23) // OK
+  newOTJInner.field1 = 31 // OK
+  assert((newOTJInner.getter1: Int) == 31) // OK
+  assert(newOTJInner.field2 == true) // OK
+  newOTJInner.field2 = false // OK
+  assert(newOTJInner.getter2 == false) // OK
+}
+

test/tasty/run-pipelined/src-3/lib/ObjectTpeJava.java

@@ -0,0 +1,38 @@
+// this test ensures that Object can accept Any from Scala
+// see Definitions.ObjectTpeJava
+package lib;
+
+@SuppressWarnings("unchecked")
+public class ObjectTpeJava {
+
+  public static class Inner<T> extends Object {
+    public T field1;
+    public T getter1() { return field1; }
+    public Object field2;
+    public Object getter2() { return field2; }
+
+    public Inner(T param1, Object param2) {
+      this.field1 = param1;
+      this.field2 = param2;
+    }
+
+    public void meth1(T arg) {}
+    public <U extends T> void meth2(U arg) {}
+  }
+
+  // 1. At the top level:
+  public void meth1(Object arg) {}
+  public <T> void meth2(T arg) {} // T implicitly extends Object
+
+  // 2. In a class type argument:
+  public void meth3(scala.collection.immutable.List<Object> arg) {}
+  public <T> void meth4(scala.collection.immutable.List<T> arg) {}
+
+  // 3. As the type argument of an array:
+  public void meth5(Object[] arg) {}
+  public <T> void meth6(T[] arg) {}
+
+  // 4. As the repeated argument of a varargs method:
+  public void meth7(Object... args) {}
+  public <T> void meth8(T... args) {}
+}