--- old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/ir/OptimisticLexicalContext.java	2020-04-15 18:48:01.000000000 +0530
+++ /dev/null	2020-04-15 18:48:01.000000000 +0530
@@ -1,128 +0,0 @@
-/*
- * Copyright (c) 2010, 2013, 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
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-package jdk.nashorn.internal.ir;
-
-import java.util.ArrayDeque;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.Deque;
-import java.util.List;
-import jdk.nashorn.internal.codegen.types.Type;
-
-/**
- * Lexical context that keeps track of optimistic assumptions (if any)
- * made during code generation. Used from Attr and FinalizeTypes
- */
-public class OptimisticLexicalContext extends LexicalContext {
-
-    private final boolean isEnabled;
-
-    class Assumption {
-        Symbol symbol;
-        Type   type;
-
-        Assumption(final Symbol symbol, final Type type) {
-            this.symbol = symbol;
-            this.type   = type;
-        }
-        @Override
-        public String toString() {
-            return symbol.getName() + "=" + type;
-        }
-    }
-
-    /** Optimistic assumptions that could be made per function */
-    private final Deque<List<Assumption>> optimisticAssumptions = new ArrayDeque<>();
-
-    /**
-     * Constructor
-     * @param isEnabled are optimistic types enabled?
-     */
-    public OptimisticLexicalContext(final boolean isEnabled) {
-        super();
-        this.isEnabled = isEnabled;
-    }
-
-    /**
-     * Are optimistic types enabled
-     * @return true if optimistic types
-     */
-    public boolean isEnabled() {
-        return isEnabled;
-    }
-
-    /**
-     * Log an optimistic assumption during codegen
-     * TODO : different parameters and more info about the assumption for future profiling
-     * needs
-     * @param symbol symbol
-     * @param type   type
-     */
-    public void logOptimisticAssumption(final Symbol symbol, final Type type) {
-        if (isEnabled) {
-            final List<Assumption> peek = optimisticAssumptions.peek();
-            peek.add(new Assumption(symbol, type));
-        }
-    }
-
-    /**
-     * Get the list of optimistic assumptions made
-     * @return optimistic assumptions
-     */
-    public List<Assumption> getOptimisticAssumptions() {
-        return Collections.unmodifiableList(optimisticAssumptions.peek());
-    }
-
-    /**
-     * Does this method have optimistic assumptions made during codegen?
-     * @return true if optimistic assumptions were made
-     */
-    public boolean hasOptimisticAssumptions() {
-        return !optimisticAssumptions.isEmpty() && !getOptimisticAssumptions().isEmpty();
-    }
-
-    @Override
-    public <T extends LexicalContextNode> T push(final T node) {
-        if (isEnabled) {
-            if(node instanceof FunctionNode) {
-                optimisticAssumptions.push(new ArrayList<Assumption>());
-            }
-        }
-
-        return super.push(node);
-    }
-
-    @Override
-    public <T extends Node> T pop(final T node) {
-        final T popped = super.pop(node);
-        if (isEnabled) {
-            if(node instanceof FunctionNode) {
-                optimisticAssumptions.pop();
-            }
-        }
-        return popped;
-    }
-
-}