Handle outers of nested Java interfaces

Author: liufengyun

compiler/src/dotty/tools/dotc/transform/init/Semantic.scala

@@ -799,7 +799,8 @@ class Semantic {
       val outerV = resolveThis(enclosing, thisV, klass, source)
       Result(outerV, Errors.empty)
     else
-      cases(tref.prefix, thisV, klass, source)
+      if cls.isAllOf(Flags.JavaInterface) then Result(Hot, Nil)
+      else cases(tref.prefix, thisV, klass, source)
 
   /** Initialize part of an abstract object in `klass` of the inheritance chain */
   def init(tpl: Template, thisV: Addr, klass: ClassSymbol): Contextual[Result] = log("init " + klass.show, printer, res => res.asInstanceOf[Result].show) {

tests/init/neg/java1.scala

@@ -0,0 +1,11 @@
+import java.util.Spliterator
+import java.util.function.Consumer
+
+class A extends Spliterator.OfDouble:
+  def characteristics() = 10
+  def estimateSize() = 10
+  def trySplit() = ???
+  def tryAdvance(x$0: java.util.function.DoubleConsumer): Boolean = false
+
+  val m = n + 1
+  val n = 10     // error