gt:         if (parameterBoundNames == null) {
context: /*
   * Copyright (c) 2014, 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.parser;
  
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import jdk.nashorn.internal.codegen.Namespace;
  import jdk.nashorn.internal.ir.Expression;
  import jdk.nashorn.internal.ir.FunctionNode;
  import jdk.nashorn.internal.ir.IdentNode;
  import jdk.nashorn.internal.ir.Module;
  
  /**
   * ParserContextNode that represents a function that is currently being parsed
   */
  class ParserContextFunctionNode extends ParserContextBaseNode {
  
      /** Function name */
      private final String name;
  
      /** Function identifier node */
      private final IdentNode ident;
  
      /** Name space for function */
      private final Namespace namespace;
  
      /** Line number for function declaration */
      private final int line;
  
      /** Function node kind, see {@link FunctionNode.Kind} */
      private final FunctionNode.Kind kind;
  
      /** List of parameter identifiers for function */
      private List<IdentNode> parameters;
  
      /** Token for function start */
      private final long token;
  
      /** Last function token */
      private long lastToken;
  
      /** Opaque node for parser end state, see {@link Parser} */
      private Object endParserState;
  
      private HashSet<String> parameterBoundNames;
      private IdentNode duplicateParameterBinding;
      private boolean simpleParameterList = true;
  
      private Module module;
  
      private int debugFlags;
      private Map<IdentNode, Expression> parameterExpressions;
  
      /**
       * @param token The token for the function
       * @param ident External function name
       * @param name  Internal name of the function
       * @param namespace Function's namespace
       * @param line  The source line of the function
       * @param kind  Function kind
       * @param parameters The parameters of the function
       */
      public ParserContextFunctionNode(final long token, final IdentNode ident, final String name, final Namespace namespace, final int line, final FunctionNode.Kind kind, final List<IdentNode> parameters) {
          this.ident      = ident;
          this.namespace  = namespace;
          this.line       = line;
          this.kind       = kind;
          this.name       = name;
          this.parameters = parameters;
          this.token      = token;
      }
  
      /**
       * @return Internal name of the function
       */
      public String getName() {
          return name;
      }
  
      /**
       * @return The external identifier for the function
       */
      public IdentNode getIdent() {
          return ident;
      }
  
      /**
       *
       * @return true if function is the program function
       */
      public boolean isProgram() {
          return getFlag(FunctionNode.IS_PROGRAM) != 0;
      }
  
      /**
       * @return if function in strict mode
       */
      public boolean isStrict() {
          return getFlag(FunctionNode.IS_STRICT) != 0;
      }
  
      /**
       * @return true if the function has nested evals
       */
      public boolean hasNestedEval() {
          return getFlag(FunctionNode.HAS_NESTED_EVAL) != 0;
      }
  
      /**
       * Returns true if any of the blocks in this function create their own scope.
       * @return true if any of the blocks in this function create their own scope.
       */
      public boolean hasScopeBlock() {
          return getFlag(FunctionNode.HAS_SCOPE_BLOCK) != 0;
      }
  
      /**
       * Create a unique name in the namespace of this FunctionNode
       * @param base prefix for name
       * @return base if no collision exists, otherwise a name prefix with base
       */
      public String uniqueName(final String base) {
          return namespace.uniqueName(base);
      }
  
      /**
       * @return line number of the function
       */
      public int getLineNumber() {
          return line;
      }
  
      /**
       * @return The kind if function
       */
      public FunctionNode.Kind getKind() {
          return kind;
      }
  
      /**
       * Get parameters
       * @return The parameters of the function
       */
      public List<IdentNode> getParameters() {
          return parameters;
      }
  
      void setParameters(final List<IdentNode> parameters) {
          this.parameters = parameters;
      }
  
      /**
       * Return ES6 function parameter expressions
       *
       * @return ES6 function parameter expressions
       */
      public Map<IdentNode, Expression> getParameterExpressions() {
          return parameterExpressions;
      }
  
      void addParameterExpression(final IdentNode ident, final Expression node) {
          if (parameterExpressions == null) {
              parameterExpressions = new HashMap<>();
          }
          parameterExpressions.put(ident, node);
      }
  
      /**
       * Set last token
       * @param token New last token
       */
      public void setLastToken(final long token) {
          this.lastToken = token;
  
      }
  
      /**
       * @return lastToken Function's last token
       */
      public long getLastToken() {
          return lastToken;
      }
  
      /**
       * Returns the ParserState of when the parsing of this function was ended
       * @return endParserState The end parser state
       */
      public Object getEndParserState() {
          return endParserState;
      }
  
      /**
       * Sets the ParserState of when the parsing of this function was ended
       * @param endParserState The end parser state
       */
      public void setEndParserState(final Object endParserState) {
          this.endParserState = endParserState;
      }
  
      /**
       * Returns the if of this function
       * @return The function id
       */
      public int getId() {
          return isProgram() ? -1 : Token.descPosition(token);
      }
  
      /**
       * Returns the debug flags for this function.
       *
       * @return the debug flags
       */
      int getDebugFlags() {
          return debugFlags;
      }
  
      /**
       * Sets a debug flag for this function.
       *
       * @param debugFlag the debug flag
       */
      void setDebugFlag(final int debugFlag) {
          debugFlags |= debugFlag;
      }
  
      public boolean isMethod() {
          return getFlag(FunctionNode.ES6_IS_METHOD) != 0;
      }
  
      public boolean isClassConstructor() {
          return getFlag(FunctionNode.ES6_IS_CLASS_CONSTRUCTOR) != 0;
      }
  
      public boolean isSubclassConstructor() {
          return getFlag(FunctionNode.ES6_IS_SUBCLASS_CONSTRUCTOR) != 0;
      }
  
      boolean addParameterBinding(final IdentNode bindingIdentifier) {
          if (Parser.isArguments(bindingIdentifier)) {
              setFlag(FunctionNode.DEFINES_ARGUMENTS);
          }
  
  