--- a/nashorn/src/jdk/nashorn/internal/codegen/FoldConstants.java	Tue Oct 08 14:57:31 2013 +0200
+++ b/nashorn/src/jdk/nashorn/internal/codegen/FoldConstants.java	Tue Oct 08 15:53:22 2013 +0200
@@ -88,8 +88,8 @@
     @Override
     public Node leaveIfNode(final IfNode ifNode) {
         final Node test = ifNode.getTest();
-        if (test instanceof LiteralNode) {
-            final Block shortCut = ((LiteralNode<?>)test).isTrue() ? ifNode.getPass() : ifNode.getFail();
+        if (test instanceof LiteralNode.PrimitiveLiteralNode) {
+            final Block shortCut = ((LiteralNode.PrimitiveLiteralNode<?>)test).isTrue() ? ifNode.getPass() : ifNode.getFail();
             if (shortCut != null) {
                 return new BlockStatement(ifNode.getLineNumber(), shortCut);
             }
@@ -101,8 +101,8 @@
     @Override
     public Node leaveTernaryNode(final TernaryNode ternaryNode) {
         final Node test = ternaryNode.getTest();
-        if (test instanceof LiteralNode) {
-            return ((LiteralNode<?>)test).isTrue() ? ternaryNode.getTrueExpression() : ternaryNode.getFalseExpression();
+        if (test instanceof LiteralNode.PrimitiveLiteralNode) {
+            return ((LiteralNode.PrimitiveLiteralNode<?>)test).isTrue() ? ternaryNode.getTrueExpression() : ternaryNode.getFalseExpression();
         }
         return ternaryNode;
     }

--- a/nashorn/src/jdk/nashorn/internal/ir/LiteralNode.java	Tue Oct 08 14:57:31 2013 +0200
+++ b/nashorn/src/jdk/nashorn/internal/ir/LiteralNode.java	Tue Oct 08 15:53:22 2013 +0200
@@ -96,14 +96,6 @@
         return value == null;
     }
 
-    /**
-     * Check if the literal value is boolean true
-     * @return true if literal value is boolean true
-     */
-    public boolean isTrue() {
-        return JSType.toBoolean(value);
-    }
-
     @Override
     public Type getType() {
         return Type.typeFor(value.getClass());
@@ -259,8 +251,31 @@
         return new NullLiteralNode(parent.getToken(), parent.getFinish());
     }
 
+    /**
+     * Super class for primitive (side-effect free) literals.
+     *
+     * @param <T> the literal type
+     */
+    public static class PrimitiveLiteralNode<T> extends LiteralNode<T> {
+        private PrimitiveLiteralNode(final long token, final int finish, final T value) {
+            super(token, finish, value);
+        }
+
+        private PrimitiveLiteralNode(final PrimitiveLiteralNode<T> literalNode) {
+            super(literalNode);
+        }
+
+        /**
+         * Check if the literal value is boolean true
+         * @return true if literal value is boolean true
+         */
+        public boolean isTrue() {
+            return JSType.toBoolean(value);
+        }
+    }
+
     @Immutable
-    private static final class BooleanLiteralNode extends LiteralNode<Boolean> {
+    private static final class BooleanLiteralNode extends PrimitiveLiteralNode<Boolean> {
 
         private BooleanLiteralNode(final long token, final int finish, final boolean value) {
             super(Token.recast(token, value ? TokenType.TRUE : TokenType.FALSE), finish, value);
@@ -312,7 +327,7 @@
     }
 
     @Immutable
-    private static final class NumberLiteralNode extends LiteralNode<Number> {
+    private static final class NumberLiteralNode extends PrimitiveLiteralNode<Number> {
 
         private final Type type = numberGetType(value);
 
@@ -374,7 +389,7 @@
         return new NumberLiteralNode(parent.getToken(), parent.getFinish(), value);
     }
 
-    private static class UndefinedLiteralNode extends LiteralNode<Undefined> {
+    private static class UndefinedLiteralNode extends PrimitiveLiteralNode<Undefined> {
         private UndefinedLiteralNode(final long token, final int finish) {
             super(Token.recast(token, TokenType.OBJECT), finish, ScriptRuntime.UNDEFINED);
         }
@@ -410,7 +425,7 @@
     }
 
     @Immutable
-    private static class StringLiteralNode extends LiteralNode<String> {
+    private static class StringLiteralNode extends PrimitiveLiteralNode<String> {
         private StringLiteralNode(final long token, final int finish, final String value) {
             super(Token.recast(token, TokenType.STRING), finish, value);
         }
@@ -522,7 +537,7 @@
         return POSTSET_MARKER;
     }
 
-    private static final class NullLiteralNode extends LiteralNode<Object> {
+    private static final class NullLiteralNode extends PrimitiveLiteralNode<Object> {
 
         private NullLiteralNode(final long token, final int finish) {
             super(Token.recast(token, TokenType.OBJECT), finish, null);

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8026042.js	Tue Oct 08 15:53:22 2013 +0200
@@ -0,0 +1,43 @@
+/*
+ * 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.
+ * 
+ * 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.
+ */
+
+/**
+ * JDK-8026042: FoldConstants need to guard against ArrayLiteralNode
+ *
+ * @test
+ * @run
+ */
+
+try {
+    if ([a]) {
+        print("fail");
+    }
+} catch (e) {
+    print(e);
+}
+
+try {
+    [a] ? print(1) : print(2);
+} catch (e) {
+    print(e);
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8026042.js.EXPECTED	Tue Oct 08 15:53:22 2013 +0200
@@ -0,0 +1,2 @@
+ReferenceError: "a" is not defined
+ReferenceError: "a" is not defined