src/jdk.compiler/share/classes/com/sun/tools/javac/comp/DeferredAttr.java

@@ -1,7 +1,7 @@
  /*
-  * Copyright (c) 2012, 2021, Oracle and/or its affiliates. All rights reserved.
+  * Copyright (c) 2012, 2024, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this

@@ -832,11 +832,11 @@
  
              @Override
              public void visitLambda(JCLambda tree) {
                  Check.CheckContext checkContext = resultInfo.checkContext;
                  Type pt = resultInfo.pt;
-                 if (!inferenceContext.inferencevars.contains(pt)) {
+                 if (!types.isQuoted(pt) && !inferenceContext.inferencevars.contains(pt)) {
                      //must be a functional descriptor
                      Type descriptorType = null;
                      try {
                          descriptorType = types.findDescriptorType(pt);
                      } catch (Types.FunctionDescriptorLookupError ex) {

@@ -1116,15 +1116,15 @@
  
      /**
       * A special tree scanner that would only visit portions of a given tree.
       * The set of nodes visited by the scanner can be customized at construction-time.
       */
-     abstract static class FilterScanner extends com.sun.tools.javac.tree.TreeScanner {
+     public abstract static class FilterScanner extends com.sun.tools.javac.tree.TreeScanner {
  
          final Predicate<JCTree> treeFilter;
  
-         FilterScanner(final Set<JCTree.Tag> validTags) {
+         protected FilterScanner(final Set<JCTree.Tag> validTags) {
              this.treeFilter = t -> validTags.contains(t.getTag());
          }
  
          @Override
          public void scan(JCTree tree) {

@@ -1138,11 +1138,11 @@
          }
  
          /**
           * handler that is executed when a node has been discarded
           */
-         void skip(JCTree tree) {}
+         protected void skip(JCTree tree) {}
      }
  
      /**
       * A tree scanner suitable for visiting the target-type dependent nodes of
       * a given argument expression.

@@ -1224,11 +1224,11 @@
          @Override
          public void visitLambda(JCLambda tree) {
              if (inferenceContext.inferenceVars().contains(pt)) {
                  stuckVars.add(pt);
              }
-             if (!types.isFunctionalInterface(pt)) {
+             if (types.isQuoted(pt) || !types.isFunctionalInterface(pt)) {
                  return;
              }
              Type descType = types.findDescriptorType(pt);
              List<Type> freeArgVars = inferenceContext.freeVarsIn(descType.getParameterTypes());
              if (tree.paramKind == JCLambda.ParameterKind.IMPLICIT &&