Version 0.5.13.1 .

pkg/analyzer_experimental/lib/src/generated/constant.dart

 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.constant;
 
 import 'java_core.dart';
 import 'source.dart' show Source;
 import 'error.dart' show AnalysisError, ErrorCode, CompileTimeErrorCode;
 import 'scanner.dart' show TokenType;
 import 'ast.dart';
 import 'element.dart';
 import 'engine.dart' show AnalysisEngine;
 
+
 /**
  * Instances of the class {@code ConstantEvaluator} evaluate constant expressions to produce their
  * compile-time value. According to the Dart Language Specification: <blockquote> A constant
  * expression is one of the following:
  * <ul>
  * <li>A literal number.</li>
  * <li>A literal boolean.</li>
  * <li>A literal string where any interpolated expression is a compile-time constant that evaluates
  * to a numeric, string or boolean value or to {@code null}.</li>
  * <li>{@code null}.</li>
@@ skipping 12 matching lines @@
  * <li>An expression of one of the forms {@code -e}, {@code e1 + e2}, {@code e1 - e2},{@code e1 * e2}, {@code e1 / e2}, {@code e1 ~/ e2}, {@code e1 > e2}, {@code e1 < e2},{@code e1 >= e2}, {@code e1 <= e2} or {@code e1 % e2}, where {@code e}, {@code e1} and {@code e2}are constant expressions that evaluate to a numeric value or to {@code null}.</li>
  * </ul>
  * </blockquote> The values returned by instances of this class are therefore {@code null} and
  * instances of the classes {@code Boolean}, {@code BigInteger}, {@code Double}, {@code String}, and{@code DartObject}.
  * <p>
  * In addition, this class defines several values that can be returned to indicate various
  * conditions encountered during evaluation. These are documented with the static field that define
  * those values.
  */
 class ConstantEvaluator {
+  
   /**
    * The source containing the expression(s) that will be evaluated.
    */
   Source _source;
+  
   /**
    * Initialize a newly created evaluator to evaluate expressions in the given source.
    * @param source the source containing the expression(s) that will be evaluated
    */
   ConstantEvaluator(Source source) {
     this._source = source;
   }
   EvaluationResult evaluate(Expression expression) {
     EvaluationResultImpl result = expression.accept(new ConstantVisitor());
     if (result is ValidResult) {
       return EvaluationResult.forValue(((result as ValidResult)).value);
     }
     List<AnalysisError> errors = new List<AnalysisError>();
     for (ErrorResult_ErrorData data in ((result as ErrorResult)).errorData) {
       ASTNode node2 = data.node;
       errors.add(new AnalysisError.con2(_source, node2.offset, node2.length, data.errorCode, []));
     }
     return EvaluationResult.forErrors(new List.from(errors));
   }
 }
+
 /**
  * Instances of the class {@code EvaluationResult} represent the result of attempting to evaluate an
  * expression.
  */
 class EvaluationResult {
+  
   /**
    * Return an evaluation result representing the result of evaluating an expression that is not a
    * compile-time constant because of the given errors.
    * @param errors the errors that should be reported for the expression(s) that were evaluated
    * @return the result of evaluating an expression that is not a compile-time constant
    */
   static EvaluationResult forErrors(List<AnalysisError> errors) => new EvaluationResult(null, errors);
+  
   /**
    * Return an evaluation result representing the result of evaluating an expression that is a
    * compile-time constant that evaluates to the given value.
    * @param value the value of the expression
    * @return the result of evaluating an expression that is a compile-time constant
    */
   static EvaluationResult forValue(Object value) => new EvaluationResult(value, null);
+  
   /**
    * The value of the expression.
    */
   Object _value;
+  
   /**
    * The errors that should be reported for the expression(s) that were evaluated.
    */
   List<AnalysisError> _errors;
+  
   /**
    * Initialize a newly created result object with the given state. Clients should use one of the
    * factory methods: {@link #forErrors(AnalysisError\[\])} and {@link #forValue(Object)}.
    * @param value the value of the expression
    * @param errors the errors that should be reported for the expression(s) that were evaluated
    */
   EvaluationResult(Object value, List<AnalysisError> errors) {
     this._value = value;
     this._errors = errors;
   }
+  
   /**
    * Return an array containing the errors that should be reported for the expression(s) that were
    * evaluated. If there are no such errors, the array will be empty. The array can be empty even if
    * the expression is not a valid compile time constant if the errors would have been reported by
    * other parts of the analysis engine.
    */
   List<AnalysisError> get errors => _errors == null ? AnalysisError.NO_ERRORS : _errors;
+  
   /**
    * Return the value of the expression, or {@code null} if the expression evaluated to {@code null}or if the expression could not be evaluated, either because it was not a compile-time constant
    * expression or because it would throw an exception when evaluated.
    * @return the value of the expression
    */
   Object get value => _value;
+  
   /**
    * Return {@code true} if the expression is a compile-time constant expression that would not
    * throw an exception when evaluated.
    * @return {@code true} if the expression is a valid compile-time constant expression
    */
   bool isValid() => _errors == null;
 }
+
 /**
  * Instances of the class {@code ConstantFinder} are used to traverse the AST structures of all of
  * the compilation units being resolved and build a table mapping constant variable elements to the
  * declarations of those variables.
  */
 class ConstantFinder extends RecursiveASTVisitor<Object> {
+  
   /**
    * A table mapping constant variable elements to the declarations of those variables.
    */
   Map<VariableElement, VariableDeclaration> _variableMap = new Map<VariableElement, VariableDeclaration>();
-  /**
-   * Initialize a newly created constant finder.
-   */
-  ConstantFinder() : super() {
-  }
+  
   /**
    * Return a table mapping constant variable elements to the declarations of those variables.
    * @return a table mapping constant variable elements to the declarations of those variables
    */
   Map<VariableElement, VariableDeclaration> get variableMap => _variableMap;
   Object visitVariableDeclaration(VariableDeclaration node) {
     super.visitVariableDeclaration(node);
     Expression initializer2 = node.initializer;
     if (initializer2 != null && node.isConst()) {
       VariableElement element2 = node.element;
       if (element2 != null) {
         _variableMap[element2] = node;
       }
     }
     return null;
   }
 }
+
 /**
  * Instances of the class {@code ConstantValueComputer} compute the values of constant variables in
  * one or more compilation units. The expected usage pattern is for the compilation units to be
  * added to this computer using the method {@link #add(CompilationUnit)} and then for the method{@link #computeValues()} to invoked exactly once. Any use of an instance after invoking the
  * method {@link #computeValues()} will result in unpredictable behavior.
  */
 class ConstantValueComputer {
+  
   /**
    * The object used to find constant variables in the compilation units that were added.
    */
   ConstantFinder _constantFinder = new ConstantFinder();
+  
   /**
    * A graph in which the nodes are the constant variables and the edges are from each variable to
    * the other constant variables that are referenced in the head's initializer.
    */
   DirectedGraph<VariableElement> _referenceGraph = new DirectedGraph<VariableElement>();
+  
   /**
    * A table mapping constant variables to the declarations of those variables.
    */
   Map<VariableElement, VariableDeclaration> _declarationMap;
-  /**
-   * Initialize a newly created constant value computer.
-   */
-  ConstantValueComputer() : super() {
-  }
+  
   /**
    * Add the constant variables in the given compilation unit to the list of constant variables
    * whose value needs to be computed.
    * @param unit the compilation unit defining the constant variables to be added
    */
   void add(CompilationUnit unit) {
     unit.accept(_constantFinder);
   }
+  
   /**
    * Compute values for all of the constant variables in the compilation units that were added.
    */
   void computeValues() {
     _declarationMap = _constantFinder.variableMap;
     for (MapEntry<VariableElement, VariableDeclaration> entry in getMapEntrySet(_declarationMap)) {
       VariableElement element = entry.getKey();
       ReferenceFinder referenceFinder = new ReferenceFinder(element, _referenceGraph);
       _referenceGraph.addNode(element);
       entry.getValue().initializer.accept(referenceFinder);
@@ skipping 10 matching lines @@
           AnalysisEngine.instance.logger.logError("Exiting constant value computer with ${_referenceGraph.nodeCount} variables that are neither sinks no in a cycle");
           return;
         }
         for (VariableElement variable in variablesInCycle) {
           generateCycleError(variablesInCycle, variable);
         }
         _referenceGraph.removeAllNodes(variablesInCycle);
       }
     }
   }
+  
   /**
    * Compute a value for the given variable.
    * @param variable the variable for which a value is to be computed
    */
   void computeValueFor(VariableElement variable) {
     VariableDeclaration declaration = _declarationMap[variable];
     if (declaration == null) {
       return;
     }
     EvaluationResultImpl result = declaration.initializer.accept(new ConstantVisitor());
     ((variable as VariableElementImpl)).evaluationResult = result;
     if (result is ErrorResult) {
       List<AnalysisError> errors = new List<AnalysisError>();
       for (ErrorResult_ErrorData data in ((result as ErrorResult)).errorData) {
         ASTNode node2 = data.node;
         Source source2 = variable.getAncestor(CompilationUnitElement).source;
         errors.add(new AnalysisError.con2(source2, node2.offset, node2.length, data.errorCode, []));
       }
     }
   }
+  
   /**
    * Generate an error indicating that the given variable is not a valid compile-time constant
    * because it references at least one of the variables in the given cycle, each of which directly
    * or indirectly references the variable.
    * @param variablesInCycle the variables in the cycle that includes the given variable
    * @param variable the variable that is not a valid compile-time constant
    */
   void generateCycleError(List<VariableElement> variablesInCycle, VariableElement variable) {
   }
 }
+
 /**
  * Instances of the class {@code ConstantVisitor} evaluate constant expressions to produce their
  * compile-time value. According to the Dart Language Specification: <blockquote> A constant
  * expression is one of the following:
  * <ul>
  * <li>A literal number.</li>
  * <li>A literal boolean.</li>
  * <li>A literal string where any interpolated expression is a compile-time constant that evaluates
  * to a numeric, string or boolean value or to {@code null}.</li>
  * <li>{@code null}.</li>
  * <li>A reference to a static constant variable.</li>
  * <li>An identifier expression that denotes a constant variable, a class or a type variable.</li>
  * <li>A constant constructor invocation.</li>
  * <li>A constant list literal.</li>
  * <li>A constant map literal.</li>
  * <li>A simple or qualified identifier denoting a top-level function or a static method.</li>
  * <li>A parenthesized expression {@code (e)} where {@code e} is a constant expression.</li>
  * <li>An expression of one of the forms {@code identical(e1, e2)}, {@code e1 == e2},{@code e1 != e2} where {@code e1} and {@code e2} are constant expressions that evaluate to a
  * numeric, string or boolean value or to {@code null}.</li>
  * <li>An expression of one of the forms {@code !e}, {@code e1 && e2} or {@code e1 || e2}, where{@code e}, {@code e1} and {@code e2} are constant expressions that evaluate to a boolean value or
  * to {@code null}.</li>
  * <li>An expression of one of the forms {@code ~e}, {@code e1 ^ e2}, {@code e1 & e2},{@code e1 | e2}, {@code e1 >> e2} or {@code e1 << e2}, where {@code e}, {@code e1} and {@code e2}are constant expressions that evaluate to an integer value or to {@code null}.</li>
  * <li>An expression of one of the forms {@code -e}, {@code e1 + e2}, {@code e1 - e2},{@code e1 * e2}, {@code e1 / e2}, {@code e1 ~/ e2}, {@code e1 > e2}, {@code e1 < e2},{@code e1 >= e2}, {@code e1 <= e2} or {@code e1 % e2}, where {@code e}, {@code e1} and {@code e2}are constant expressions that evaluate to a numeric value or to {@code null}.</li>
  * </ul>
  * </blockquote>
  */
 class ConstantVisitor extends GeneralizingASTVisitor<EvaluationResultImpl> {
-  /**
-   * Initialize a newly created constant visitor.
-   */
-  ConstantVisitor() : super() {
-  }
   EvaluationResultImpl visitAdjacentStrings(AdjacentStrings node) {
     EvaluationResultImpl result = null;
     for (StringLiteral string in node.strings) {
       if (result == null) {
         result = string.accept(this);
       } else {
         result = result.concatenate(node, string.accept(this));
       }
     }
     return result;
   }
   EvaluationResultImpl visitBinaryExpression(BinaryExpression node) {
     EvaluationResultImpl leftResult = node.leftOperand.accept(this);
     EvaluationResultImpl rightResult = node.rightOperand.accept(this);
+    TokenType operatorType = node.operator.type;
+    if (operatorType != TokenType.BANG_EQ && operatorType != TokenType.EQ_EQ) {
+      if (leftResult is ValidResult && ((leftResult as ValidResult)).isNull() || rightResult is ValidResult && ((rightResult as ValidResult)).isNull()) {
+        return error(node, CompileTimeErrorCode.CONST_EVAL_THROWS_EXCEPTION);
+      }
+    }
     while (true) {
-      if (node.operator.type == TokenType.AMPERSAND) {
+      if (operatorType == TokenType.AMPERSAND) {
         return leftResult.bitAnd(node, rightResult);
-      } else if (node.operator.type == TokenType.AMPERSAND_AMPERSAND) {
+      } else if (operatorType == TokenType.AMPERSAND_AMPERSAND) {
         return leftResult.logicalAnd(node, rightResult);
-      } else if (node.operator.type == TokenType.BANG_EQ) {
+      } else if (operatorType == TokenType.BANG_EQ) {
         return leftResult.notEqual(node, rightResult);
-      } else if (node.operator.type == TokenType.BAR) {
+      } else if (operatorType == TokenType.BAR) {
         return leftResult.bitOr(node, rightResult);
-      } else if (node.operator.type == TokenType.BAR_BAR) {
+      } else if (operatorType == TokenType.BAR_BAR) {
         return leftResult.logicalOr(node, rightResult);
-      } else if (node.operator.type == TokenType.CARET) {
+      } else if (operatorType == TokenType.CARET) {
         return leftResult.bitXor(node, rightResult);
-      } else if (node.operator.type == TokenType.EQ_EQ) {
+      } else if (operatorType == TokenType.EQ_EQ) {
         return leftResult.equalEqual(node, rightResult);
-      } else if (node.operator.type == TokenType.GT) {
+      } else if (operatorType == TokenType.GT) {
         return leftResult.greaterThan(node, rightResult);
-      } else if (node.operator.type == TokenType.GT_EQ) {
+      } else if (operatorType == TokenType.GT_EQ) {
         return leftResult.greaterThanOrEqual(node, rightResult);
-      } else if (node.operator.type == TokenType.GT_GT) {
+      } else if (operatorType == TokenType.GT_GT) {
         return leftResult.shiftRight(node, rightResult);
-      } else if (node.operator.type == TokenType.LT) {
+      } else if (operatorType == TokenType.LT) {
         return leftResult.lessThan(node, rightResult);
-      } else if (node.operator.type == TokenType.LT_EQ) {
+      } else if (operatorType == TokenType.LT_EQ) {
         return leftResult.lessThanOrEqual(node, rightResult);
-      } else if (node.operator.type == TokenType.LT_LT) {
+      } else if (operatorType == TokenType.LT_LT) {
         return leftResult.shiftLeft(node, rightResult);
-      } else if (node.operator.type == TokenType.MINUS) {
+      } else if (operatorType == TokenType.MINUS) {
         return leftResult.minus(node, rightResult);
-      } else if (node.operator.type == TokenType.PERCENT) {
+      } else if (operatorType == TokenType.PERCENT) {
         return leftResult.remainder(node, rightResult);
-      } else if (node.operator.type == TokenType.PLUS) {
+      } else if (operatorType == TokenType.PLUS) {
         return leftResult.add(node, rightResult);
-      } else if (node.operator.type == TokenType.STAR) {
+      } else if (operatorType == TokenType.STAR) {
         return leftResult.times(node, rightResult);
-      } else if (node.operator.type == TokenType.SLASH) {
+      } else if (operatorType == TokenType.SLASH) {
         return leftResult.divide(node, rightResult);
-      } else if (node.operator.type == TokenType.TILDE_SLASH) {
+      } else if (operatorType == TokenType.TILDE_SLASH) {
         return leftResult.integerDivide(node, rightResult);
       }
       break;
     }
     return error(node, null);
   }
   EvaluationResultImpl visitBooleanLiteral(BooleanLiteral node) => node.value ? ValidResult.RESULT_TRUE : ValidResult.RESULT_FALSE;
   EvaluationResultImpl visitDoubleLiteral(DoubleLiteral node) => new ValidResult(node.value);
   EvaluationResultImpl visitInstanceCreationExpression(InstanceCreationExpression node) {
     ConstructorElement constructor = node.element;
@@ skipping 45 matching lines @@
               EvaluationResultImpl rightArgument = arguments2[1].accept(this);
               return leftArgument.equalEqual(node, rightArgument);
             }
           }
         }
       }
     }
     return error(node, null);
   }
   EvaluationResultImpl visitNode(ASTNode node) => error(node, null);
-  EvaluationResultImpl visitNullLiteral(NullLiteral node) => new ValidResult(null);
+  EvaluationResultImpl visitNullLiteral(NullLiteral node) => ValidResult.RESULT_NULL;
   EvaluationResultImpl visitParenthesizedExpression(ParenthesizedExpression node) => node.expression.accept(this);
   EvaluationResultImpl visitPrefixedIdentifier(PrefixedIdentifier node) => getConstantValue(node, node.element);
   EvaluationResultImpl visitPrefixExpression(PrefixExpression node) {
     EvaluationResultImpl operand2 = node.operand.accept(this);
+    if (operand2 is ValidResult && ((operand2 as ValidResult)).isNull()) {
+      return error(node, CompileTimeErrorCode.CONST_EVAL_THROWS_EXCEPTION);
+    }
     while (true) {
       if (node.operator.type == TokenType.BANG) {
         return operand2.logicalNot(node);
       } else if (node.operator.type == TokenType.TILDE) {
         return operand2.bitNot(node);
       } else if (node.operator.type == TokenType.MINUS) {
         return operand2.negated(node);
       }
       break;
     }
     return error(node, null);
   }
   EvaluationResultImpl visitPropertyAccess(PropertyAccess node) => getConstantValue(node, node.propertyName.element);
   EvaluationResultImpl visitSimpleIdentifier(SimpleIdentifier node) => getConstantValue(node, node.element);
   EvaluationResultImpl visitSimpleStringLiteral(SimpleStringLiteral node) => new ValidResult(node.value);
   EvaluationResultImpl visitStringInterpolation(StringInterpolation node) {
     EvaluationResultImpl result = null;
     for (InterpolationElement element in node.elements) {
       if (result == null) {
         result = element.accept(this);
       } else {
         result = result.concatenate(node, element.accept(this));
       }
     }
     return result;
   }
+  
   /**
    * Return a result object representing an error associated with the given node.
    * @param node the AST node associated with the error
    * @param code the error code indicating the nature of the error
    * @return a result object representing an error associated with the given node
    */
   ErrorResult error(ASTNode node, ErrorCode code) => new ErrorResult.con1(node, code == null ? CompileTimeErrorCode.INVALID_CONSTANT : code);
+  
   /**
    * Return the constant value of the static constant represented by the given element.
    * @param node the node to be used if an error needs to be reported
    * @param element the element whose value is to be returned
    * @return the constant value of the static constant
    */
   EvaluationResultImpl getConstantValue(ASTNode node, Element element) {
     if (element is PropertyAccessorElement) {
       element = ((element as PropertyAccessorElement)).variable;
     }
     if (element is VariableElementImpl) {
       EvaluationResultImpl value = ((element as VariableElementImpl)).evaluationResult;
       if (value != null) {
         return value;
       }
     } else if (element is ExecutableElement) {
       return new ValidResult(element);
+    } else if (element is ClassElement) {
+      return ValidResult.RESULT_OBJECT;
     }
     return error(node, null);
   }
+  
   /**
    * Return the union of the errors encoded in the given results.
    * @param leftResult the first set of errors, or {@code null} if there was no previous collection
    * of errors
    * @param rightResult the errors to be added to the collection, or a valid result if there are no
    * errors to be added
    * @return the union of the errors encoded in the given results
    */
   ErrorResult union(ErrorResult leftResult, EvaluationResultImpl rightResult) {
     if (rightResult is ErrorResult) {
       if (leftResult != null) {
         return new ErrorResult.con2(leftResult, (rightResult as ErrorResult));
       } else {
         return rightResult as ErrorResult;
       }
     }
     return leftResult;
   }
 }
+
 /**
  * Instances of the class {@code DirectedGraph} implement a directed graph in which the nodes are
  * arbitrary (client provided) objects and edges are represented implicitly. The graph will allow an
  * edge from any node to any other node, including itself, but will not represent multiple edges
  * between the same pair of nodes.
  * @param N the type of the nodes in the graph
  */
 class DirectedGraph<N> {
+  
   /**
    * The table encoding the edges in the graph. An edge is represented by an entry mapping the head
    * to a set of tails. Nodes that are not the head of any edge are represented by an entry mapping
    * the node to an empty set of tails.
    */
   Map<N, Set<N>> _edges = new Map<N, Set<N>>();
-  /**
-   * Initialize a newly create directed graph to be empty.
-   */
-  DirectedGraph() : super() {
-  }
+  
   /**
    * Add an edge from the given head node to the given tail node. Both nodes will be a part of the
    * graph after this method is invoked, whether or not they were before.
    * @param head the node at the head of the edge
    * @param tail the node at the tail of the edge
    */
   void addEdge(N head, N tail) {
     Set<N> tails = _edges[tail];
     if (tails == null) {
       _edges[tail] = new Set<N>();
     }
     tails = _edges[head];
     if (tails == null) {
       tails = new Set<N>();
       _edges[head] = tails;
     }
     javaSetAdd(tails, tail);
   }
+  
   /**
    * Add the given node to the set of nodes in the graph.
    * @param node the node to be added
    */
   void addNode(N node) {
     Set<N> tails = _edges[node];
     if (tails == null) {
       _edges[node] = new Set<N>();
     }
   }
+  
   /**
    * Return a list of nodes that form a cycle, or {@code null} if there are no cycles in this graph.
    * @return a list of nodes that form a cycle
    */
   List<N> findCycle() => null;
+  
   /**
    * Return the number of nodes in this graph.
    * @return the number of nodes in this graph
    */
   int get nodeCount => _edges.length;
+  
   /**
    * Return a set containing the tails of edges that have the given node as their head. The set will
    * be empty if there are no such edges or if the node is not part of the graph. Clients must not
    * modify the returned set.
    * @param head the node at the head of all of the edges whose tails are to be returned
    * @return a set containing the tails of edges that have the given node as their head
    */
   Set<N> getTails(N head) {
     Set<N> tails = _edges[head];
     if (tails == null) {
       return new Set<N>();
     }
     return tails;
   }
+  
   /**
    * Return {@code true} if this graph is empty.
    * @return {@code true} if this graph is empty
    */
   bool isEmpty() => _edges.isEmpty;
+  
   /**
    * Remove all of the given nodes from this graph. As a consequence, any edges for which those
    * nodes were either a head or a tail will also be removed.
    * @param nodes the nodes to be removed
    */
   void removeAllNodes(List<N> nodes) {
     for (N node in nodes) {
       removeNode(node);
     }
   }
+  
   /**
    * Remove the edge from the given head node to the given tail node. If there was no such edge then
    * the graph will be unmodified: the number of edges will be the same and the set of nodes will be
    * the same (neither node will either be added or removed).
    * @param head the node at the head of the edge
    * @param tail the node at the tail of the edge
    * @return {@code true} if the graph was modified as a result of this operation
    */
   void removeEdge(N head, N tail) {
     Set<N> tails = _edges[head];
     if (tails != null) {
       tails.remove(tail);
     }
   }
+  
   /**
    * Remove the given node from this graph. As a consequence, any edges for which that node was
    * either a head or a tail will also be removed.
    * @param node the node to be removed
    */
   void removeNode(N node) {
     _edges.remove(node);
     for (Set<N> tails in _edges.values) {
       tails.remove(node);
     }
   }
+  
   /**
    * Find one node (referred to as a sink node) that has no outgoing edges (that is, for which there
    * are no edges that have that node as the head of the edge) and remove it from this graph. Return
    * the node that was removed, or {@code null} if there are no such nodes either because the graph
    * is empty or because every node in the graph has at least one outgoing edge. As a consequence of
    * removing the node from the graph any edges for which that node was a tail will also be removed.
    * @return the sink node that was removed
    */
   N removeSink() {
     N sink = findSink();
     if (sink == null) {
       return null;
     }
     removeNode(sink);
     return sink;
   }
+  
   /**
    * Return one node that has no outgoing edges (that is, for which there are no edges that have
    * that node as the head of the edge), or {@code null} if there are no such nodes.
    * @return a sink node
    */
   N findSink() {
     for (MapEntry<N, Set<N>> entry in getMapEntrySet(_edges)) {
       if (entry.getValue().isEmpty) {
         return entry.getKey();
       }
     }
     return null;
   }
 }
+
 /**
  * Instances of the class {@code ErrorResult} represent the result of evaluating an expression that
  * is not a valid compile time constant.
  */
 class ErrorResult extends EvaluationResultImpl {
+  
   /**
    * The errors that prevent the expression from being a valid compile time constant.
    */
   List<ErrorResult_ErrorData> _errors = new List<ErrorResult_ErrorData>();
+  
   /**
    * Initialize a newly created result representing the error with the given code reported against
    * the given node.
    * @param node the node against which the error should be reported
    * @param errorCode the error code for the error to be generated
    */
   ErrorResult.con1(ASTNode node, ErrorCode errorCode) {
-    _jtd_constructor_168_impl(node, errorCode);
+    _jtd_constructor_171_impl(node, errorCode);
   }
-  _jtd_constructor_168_impl(ASTNode node, ErrorCode errorCode) {
+  _jtd_constructor_171_impl(ASTNode node, ErrorCode errorCode) {
     _errors.add(new ErrorResult_ErrorData(node, errorCode));
   }
+  
   /**
    * Initialize a newly created result to represent the union of the errors in the given result
    * objects.
    * @param firstResult the first set of results being merged
    * @param secondResult the second set of results being merged
    */
   ErrorResult.con2(ErrorResult firstResult, ErrorResult secondResult) {
-    _jtd_constructor_169_impl(firstResult, secondResult);
+    _jtd_constructor_172_impl(firstResult, secondResult);
   }
-  _jtd_constructor_169_impl(ErrorResult firstResult, ErrorResult secondResult) {
+  _jtd_constructor_172_impl(ErrorResult firstResult, ErrorResult secondResult) {
     _errors.addAll(firstResult._errors);
     _errors.addAll(secondResult._errors);
   }
   EvaluationResultImpl add(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.addToError(node, this);
   EvaluationResultImpl bitAnd(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.bitAndError(node, this);
   EvaluationResultImpl bitNot(Expression node) => this;
   EvaluationResultImpl bitOr(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.bitOrError(node, this);
   EvaluationResultImpl bitXor(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.bitXorError(node, this);
   EvaluationResultImpl concatenate(Expression node, EvaluationResultImpl rightOperand) => rightOperand.concatenateError(node, this);
   EvaluationResultImpl divide(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.divideError(node, this);
@@ skipping 50 matching lines @@
   EvaluationResultImpl remainderError(BinaryExpression node, ErrorResult leftOperand) => new ErrorResult.con2(this, leftOperand);
   EvaluationResultImpl remainderValid(BinaryExpression node, ValidResult leftOperand) => this;
   EvaluationResultImpl shiftLeftError(BinaryExpression node, ErrorResult leftOperand) => new ErrorResult.con2(this, leftOperand);
   EvaluationResultImpl shiftLeftValid(BinaryExpression node, ValidResult leftOperand) => this;
   EvaluationResultImpl shiftRightError(BinaryExpression node, ErrorResult leftOperand) => new ErrorResult.con2(this, leftOperand);
   EvaluationResultImpl shiftRightValid(BinaryExpression node, ValidResult leftOperand) => this;
   EvaluationResultImpl timesError(BinaryExpression node, ErrorResult leftOperand) => new ErrorResult.con2(this, leftOperand);
   EvaluationResultImpl timesValid(BinaryExpression node, ValidResult leftOperand) => this;
 }
 class ErrorResult_ErrorData {
+  
   /**
    * The node against which the error should be reported.
    */
   ASTNode _node;
+  
   /**
    * The error code for the error to be generated.
    */
   ErrorCode _errorCode;
+  
   /**
    * Initialize a newly created data holder to represent the error with the given code reported
    * against the given node.
    * @param node the node against which the error should be reported
    * @param errorCode the error code for the error to be generated
    */
   ErrorResult_ErrorData(ASTNode node, ErrorCode errorCode) {
     this._node = node;
     this._errorCode = errorCode;
   }
+  
   /**
    * Return the error code for the error to be generated.
    * @return the error code for the error to be generated
    */
   ErrorCode get errorCode => _errorCode;
+  
   /**
    * Return the node against which the error should be reported.
    * @return the node against which the error should be reported
    */
   ASTNode get node => _node;
 }
+
 /**
  * Instances of the class {@code InternalResult} represent the result of attempting to evaluate a
  * expression.
  */
 abstract class EvaluationResultImpl {
   EvaluationResultImpl add(BinaryExpression node, EvaluationResultImpl rightOperand);
   EvaluationResultImpl bitAnd(BinaryExpression node, EvaluationResultImpl rightOperand);
   EvaluationResultImpl bitNot(Expression node);
   EvaluationResultImpl bitOr(BinaryExpression node, EvaluationResultImpl rightOperand);
   EvaluationResultImpl bitXor(BinaryExpression node, EvaluationResultImpl rightOperand);
@@ skipping 50 matching lines @@
   EvaluationResultImpl notEqualValid(BinaryExpression node, ValidResult leftOperand);
   EvaluationResultImpl remainderError(BinaryExpression node, ErrorResult leftOperand);
   EvaluationResultImpl remainderValid(BinaryExpression node, ValidResult leftOperand);
   EvaluationResultImpl shiftLeftError(BinaryExpression node, ErrorResult leftOperand);
   EvaluationResultImpl shiftLeftValid(BinaryExpression node, ValidResult leftOperand);
   EvaluationResultImpl shiftRightError(BinaryExpression node, ErrorResult leftOperand);
   EvaluationResultImpl shiftRightValid(BinaryExpression node, ValidResult leftOperand);
   EvaluationResultImpl timesError(BinaryExpression node, ErrorResult leftOperand);
   EvaluationResultImpl timesValid(BinaryExpression node, ValidResult leftOperand);
 }
+
 /**
  * Instances of the class {@code ReferenceFinder} add reference information for a given variable to
  * the bi-directional mapping used to order the evaluation of constants.
  */
 class ReferenceFinder extends RecursiveASTVisitor<Object> {
+  
   /**
    * The element representing the variable whose initializer will be visited.
    */
   VariableElement _source;
+  
   /**
    * A graph in which the nodes are the constant variables and the edges are from each variable to
    * the other constant variables that are referenced in the head's initializer.
    */
   DirectedGraph<VariableElement> _referenceGraph;
+  
   /**
    * Initialize a newly created reference finder to find references from the given variable to other
    * variables and to add those references to the given graph.
    * @param source the element representing the variable whose initializer will be visited
    * @param referenceGraph a graph recording which variables (heads) reference which other variables
    * (tails) in their initializers
    */
   ReferenceFinder(VariableElement source, DirectedGraph<VariableElement> referenceGraph) {
     this._source = source;
     this._referenceGraph = referenceGraph;
   }
   Object visitSimpleIdentifier(SimpleIdentifier node) {
     Element element2 = node.element;
     if (element2 is PropertyAccessorElement) {
       element2 = ((element2 as PropertyAccessorElement)).variable;
     }
     if (element2 is VariableElement) {
       VariableElement variable = element2 as VariableElement;
       if (variable.isConst()) {
         _referenceGraph.addEdge(_source, variable);
       }
     }
     return null;
   }
 }
+
 /**
  * Instances of the class {@code ValidResult} represent the result of attempting to evaluate a valid
  * compile time constant expression.
  */
 class ValidResult extends EvaluationResultImpl {
+  
   /**
    * A result object representing the value 'false'.
    */
   static ValidResult RESULT_FALSE = new ValidResult(false);
+  
+  /**
+   * A result object representing the an object without specific type on which no further operations
+   * can be performed.
+   */
+  static ValidResult RESULT_DYNAMIC = new ValidResult(null);
+  
+  /**
+   * A result object representing the an arbitrary integer on which no further operations can be
+   * performed.
+   */
+  static ValidResult RESULT_INT = new ValidResult(null);
+  
+  /**
+   * A result object representing the {@code null} value.
+   */
+  static ValidResult RESULT_NULL = new ValidResult(null);
+  
+  /**
+   * A result object representing the an arbitrary numeric on which no further operations can be
+   * performed.
+   */
+  static ValidResult RESULT_NUM = new ValidResult(null);
+  
+  /**
+   * A result object representing the an arbitrary boolean on which no further operations can be
+   * performed.
+   */
+  static ValidResult RESULT_BOOL = new ValidResult(null);
+  
   /**
    * A result object representing the an arbitrary object on which no further operations can be
    * performed.
    */
   static ValidResult RESULT_OBJECT = new ValidResult(new Object());
+  
+  /**
+   * A result object representing the an arbitrary string on which no further operations can be
+   * performed.
+   */
+  static ValidResult RESULT_STRING = new ValidResult("<string>");
+  
   /**
    * A result object representing the value 'true'.
    */
   static ValidResult RESULT_TRUE = new ValidResult(true);
+  
   /**
    * The value of the expression.
    */
   Object _value;
+  
   /**
    * Initialize a newly created result to represent the given value.
    * @param value the value of the expression
    */
   ValidResult(Object value) {
     this._value = value;
   }
   EvaluationResultImpl add(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.addToValid(node, this);
   EvaluationResultImpl bitAnd(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.bitAndValid(node, this);
   EvaluationResultImpl bitNot(Expression node) {
+    if (isSomeInt()) {
+      return RESULT_INT;
+    }
     if (_value == null) {
       return error(node);
     } else if (_value is int) {
       return valueOf(~((_value as int)));
     }
     return error(node);
   }
   EvaluationResultImpl bitOr(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.bitOrValid(node, this);
   EvaluationResultImpl bitXor(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.bitXorValid(node, this);
   EvaluationResultImpl concatenate(Expression node, EvaluationResultImpl rightOperand) => rightOperand.concatenateValid(node, this);
   EvaluationResultImpl divide(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.divideValid(node, this);
   EvaluationResultImpl equalEqual(Expression node, EvaluationResultImpl rightOperand) => rightOperand.equalEqualValid(node, this);
   Object get value => _value;
   EvaluationResultImpl greaterThan(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.greaterThanValid(node, this);
   EvaluationResultImpl greaterThanOrEqual(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.greaterThanOrEqualValid(node, this);
   EvaluationResultImpl integerDivide(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.integerDivideValid(node, this);
   EvaluationResultImpl lessThan(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.lessThanValid(node, this);
   EvaluationResultImpl lessThanOrEqual(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.lessThanOrEqualValid(node, this);
   EvaluationResultImpl logicalAnd(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.logicalAndValid(node, this);
   EvaluationResultImpl logicalNot(Expression node) {
+    if (isSomeBool()) {
+      return RESULT_BOOL;
+    }
     if (_value == null) {
       return RESULT_TRUE;
     } else if (_value is bool) {
       return ((_value as bool)) ? RESULT_FALSE : RESULT_TRUE;
     }
     return error(node);
   }
   EvaluationResultImpl logicalOr(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.logicalOrValid(node, this);
   EvaluationResultImpl minus(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.minusValid(node, this);
   EvaluationResultImpl negated(Expression node) {
+    if (isSomeNum()) {
+      return RESULT_INT;
+    }
     if (_value == null) {
       return error(node);
     } else if (_value is int) {
       return valueOf(-((_value as int)));
     } else if (_value is double) {
       return valueOf3(-((_value as double)));
     }
     return error(node);
   }
   EvaluationResultImpl notEqual(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.notEqualValid(node, this);
@@ skipping 16 matching lines @@
   EvaluationResultImpl shiftRight(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.shiftRightValid(node, this);
   EvaluationResultImpl times(BinaryExpression node, EvaluationResultImpl rightOperand) => rightOperand.timesValid(node, this);
   String toString() {
     if (_value == null) {
       return "null";
     }
     return _value.toString();
   }
   EvaluationResultImpl addToError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl addToValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeNum() || leftOperand2.isSomeNum()) {
+      if (isAnyNum() && leftOperand2.isAnyNum()) {
+        return RESULT_NUM;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_NUM);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         return valueOf(((leftValue as int)) + (_value as int));
       } else if (_value is double) {
         return valueOf3(((leftValue as int)).toDouble() + ((_value as double)));
       }
     } else if (leftValue is double) {
       if (_value is int) {
         return valueOf3(((leftValue as double)) + ((_value as int)).toDouble());
       } else if (_value is double) {
         return valueOf3(((leftValue as double)) + ((_value as double)));
       }
     } else if (leftValue is String) {
       if (_value is String) {
         return valueOf4("${((leftValue as String))}${((_value as String))}");
       }
     }
     return error(node);
   }
   EvaluationResultImpl bitAndError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl bitAndValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeInt() || leftOperand2.isSomeInt()) {
+      if (isAnyInt() && leftOperand2.isAnyInt()) {
+        return RESULT_INT;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_INT);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         return valueOf(((leftValue as int)) & (_value as int));
       }
       return error(node.leftOperand);
     }
     if (_value is int) {
       return error(node.rightOperand);
     }
     return union(error(node.leftOperand), error(node.rightOperand));
   }
   EvaluationResultImpl bitOrError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl bitOrValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeInt() || leftOperand2.isSomeInt()) {
+      if (isAnyInt() && leftOperand2.isAnyInt()) {
+        return RESULT_INT;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_INT);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         return valueOf(((leftValue as int)) | (_value as int));
       }
       return error(node.leftOperand);
     }
     if (_value is int) {
       return error(node.rightOperand);
     }
     return union(error(node.leftOperand), error(node.rightOperand));
   }
   EvaluationResultImpl bitXorError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl bitXorValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeInt() || leftOperand2.isSomeInt()) {
+      if (isAnyInt() && leftOperand2.isAnyInt()) {
+        return RESULT_INT;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_INT);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         return valueOf(((leftValue as int)) ^ (_value as int));
       }
       return error(node.leftOperand);
     }
     if (_value is int) {
       return error(node.rightOperand);
     }
     return union(error(node.leftOperand), error(node.rightOperand));
   }
   EvaluationResultImpl concatenateError(Expression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl concatenateValid(Expression node, ValidResult leftOperand) {
     Object leftValue = leftOperand.value;
     if (leftValue is String && _value is String) {
       return valueOf4("${((leftValue as String))}${((_value as String))}");
     }
     return error(node);
   }
   EvaluationResultImpl divideError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl divideValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeNum() || leftOperand2.isSomeNum()) {
+      if (isAnyNum() && leftOperand2.isAnyNum()) {
+        return RESULT_NUM;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_NUM);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         if (((_value as int)) == 0) {
           return valueOf3(((leftValue as int)).toDouble() / ((_value as int)).toDouble());
         }
         return valueOf(((leftValue as int)) ~/ (_value as int));
       } else if (_value is double) {
         return valueOf3(((leftValue as int)).toDouble() / ((_value as double)));
       }
     } else if (leftValue is double) {
       if (_value is int) {
         return valueOf3(((leftValue as double)) / ((_value as int)).toDouble());
       } else if (_value is double) {
         return valueOf3(((leftValue as double)) / ((_value as double)));
       }
     }
     return error(node);
   }
   EvaluationResultImpl equalEqualError(Expression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl equalEqualValid(Expression node, ValidResult leftOperand) {
+    if (node is BinaryExpression) {
+      if (!isAnyNullBoolNumString() || !leftOperand.isAnyNullBoolNumString()) {
+        return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_BOOL_NUM_STRING);
+      }
+    }
     Object leftValue = leftOperand.value;
     if (leftValue == null) {
       return valueOf2(_value == null);
     } else if (leftValue is bool) {
       if (_value is bool) {
         return valueOf2(identical(((leftValue as bool)), ((_value as bool))));
       }
       return RESULT_FALSE;
     } else if (leftValue is int) {
       if (_value is int) {
@@ skipping 13 matching lines @@
       if (_value is String) {
         return valueOf2(((leftValue as String)) == _value);
       }
       return RESULT_FALSE;
     }
     return RESULT_FALSE;
   }
   EvaluationResultImpl greaterThanError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl greaterThanOrEqualError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl greaterThanOrEqualValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeNum() || leftOperand2.isSomeNum()) {
+      if (isAnyNum() && leftOperand2.isAnyNum()) {
+        return RESULT_BOOL;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_NUM);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         return valueOf2(((leftValue as int)).compareTo((_value as int)) >= 0);
       } else if (_value is double) {
         return valueOf2(((leftValue as int)).toDouble() >= ((_value as double)));
       }
     } else if (leftValue is double) {
       if (_value is int) {
         return valueOf2(((leftValue as double)) >= ((_value as int)).toDouble());
       } else if (_value is double) {
         return valueOf2(((leftValue as double)) >= ((_value as double)));
       }
     }
     return error(node);
   }
   EvaluationResultImpl greaterThanValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeNum() || leftOperand2.isSomeNum()) {
+      if (isAnyNum() && leftOperand2.isAnyNum()) {
+        return RESULT_BOOL;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_NUM);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         return valueOf2(((leftValue as int)).compareTo((_value as int)) > 0);
       } else if (_value is double) {
         return valueOf2(((leftValue as int)).toDouble() > ((_value as double)));
       }
     } else if (leftValue is double) {
       if (_value is int) {
         return valueOf2(((leftValue as double)) > ((_value as int)).toDouble());
       } else if (_value is double) {
         return valueOf2(((leftValue as double)) > ((_value as double)));
       }
     }
     return error(node);
   }
   EvaluationResultImpl integerDivideError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl integerDivideValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeNum() || leftOperand2.isSomeNum()) {
+      if (isAnyNum() && leftOperand2.isAnyNum()) {
+        return RESULT_INT;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_NUM);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         if (((_value as int)) == 0) {
           return valueOf3(((leftValue as int)).toDouble() / ((_value as int)).toDouble());
         }
         return valueOf(((leftValue as int)) ~/ (_value as int));
       } else if (_value is double) {
         double result = ((leftValue as int)).toDouble() / ((_value as double));
         return valueOf((result as int));
       }
     } else if (leftValue is double) {
       if (_value is int) {
         double result = ((leftValue as double)) / ((_value as int)).toDouble();
         return valueOf((result as int));
       } else if (_value is double) {
         double result = ((leftValue as double)) / ((_value as double));
         return valueOf((result as int));
       }
     }
     return error(node);
   }
   EvaluationResultImpl lessThanError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl lessThanOrEqualError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl lessThanOrEqualValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeNum() || leftOperand2.isSomeNum()) {
+      if (isAnyNum() && leftOperand2.isAnyNum()) {
+        return RESULT_BOOL;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_NUM);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         return valueOf2(((leftValue as int)).compareTo((_value as int)) <= 0);
       } else if (_value is double) {
         return valueOf2(((leftValue as int)).toDouble() <= ((_value as double)));
       }
     } else if (leftValue is double) {
       if (_value is int) {
         return valueOf2(((leftValue as double)) <= ((_value as int)).toDouble());
       } else if (_value is double) {
         return valueOf2(((leftValue as double)) <= ((_value as double)));
       }
     }
     return error(node);
   }
   EvaluationResultImpl lessThanValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeNum() || leftOperand2.isSomeNum()) {
+      if (isAnyNum() && leftOperand2.isAnyNum()) {
+        return RESULT_BOOL;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_NUM);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         return valueOf2(((leftValue as int)).compareTo((_value as int)) < 0);
       } else if (_value is double) {
         return valueOf2(((leftValue as int)).toDouble() < ((_value as double)));
       }
     } else if (leftValue is double) {
       if (_value is int) {
         return valueOf2(((leftValue as double)) < ((_value as int)).toDouble());
       } else if (_value is double) {
         return valueOf2(((leftValue as double)) < ((_value as double)));
       }
     }
     return error(node);
   }
   EvaluationResultImpl logicalAndError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl logicalAndValid(BinaryExpression node, ValidResult leftOperand) {
+    if (isSomeBool() || leftOperand.isSomeBool()) {
+      if (isAnyBool() && leftOperand.isAnyBool()) {
+        return RESULT_BOOL;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_BOOL);
+    }
     Object leftValue = leftOperand.value;
-    if (leftValue is bool && ((leftValue as bool))) {
-      return booleanConversion(node.rightOperand, _value);
+    if (leftValue is bool) {
+      if (((leftValue as bool))) {
+        return booleanConversion(node.rightOperand, _value);
+      }
+      return RESULT_FALSE;
     }
-    return RESULT_FALSE;
+    return error(node);
   }
   EvaluationResultImpl logicalOrError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl logicalOrValid(BinaryExpression node, ValidResult leftOperand) {
+    if (isSomeBool() || leftOperand.isSomeBool()) {
+      if (isAnyBool() && leftOperand.isAnyBool()) {
+        return RESULT_BOOL;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_BOOL);
+    }
     Object leftValue = leftOperand.value;
     if (leftValue is bool && ((leftValue as bool))) {
       return RESULT_TRUE;
     }
     return booleanConversion(node.rightOperand, _value);
   }
   EvaluationResultImpl minusError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl minusValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeNum() || leftOperand2.isSomeNum()) {
+      if (isAnyNum() && leftOperand2.isAnyNum()) {
+        return RESULT_NUM;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_NUM);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         return valueOf(((leftValue as int)) - (_value as int));
       } else if (_value is double) {
         return valueOf3(((leftValue as int)).toDouble() - ((_value as double)));
       }
     } else if (leftValue is double) {
       if (_value is int) {
         return valueOf3(((leftValue as double)) - ((_value as int)).toDouble());
       } else if (_value is double) {
         return valueOf3(((leftValue as double)) - ((_value as double)));
       }
     }
     return error(node);
   }
   EvaluationResultImpl notEqualError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl notEqualValid(BinaryExpression node, ValidResult leftOperand) {
+    if (!isAnyNullBoolNumString() || !leftOperand.isAnyNullBoolNumString()) {
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_BOOL_NUM_STRING);
+    }
     Object leftValue = leftOperand.value;
     if (leftValue == null) {
       return valueOf2(_value != null);
     } else if (leftValue is bool) {
       if (_value is bool) {
         return valueOf2(((leftValue as bool)) != ((_value as bool)));
       }
       return RESULT_TRUE;
     } else if (leftValue is int) {
       if (_value is int) {
@@ skipping 12 matching lines @@
     } else if (leftValue is String) {
       if (_value is String) {
         return valueOf2(((leftValue as String)) != _value);
       }
       return RESULT_TRUE;
     }
     return RESULT_TRUE;
   }
   EvaluationResultImpl remainderError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl remainderValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeNum() || leftOperand2.isSomeNum()) {
+      if (isAnyNum() && leftOperand2.isAnyNum()) {
+        return RESULT_NUM;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_NUM);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         if (((_value as int)) == 0) {
           return valueOf3(((leftValue as int)).toDouble() % ((_value as int)).toDouble());
         }
         return valueOf(((leftValue as int)).remainder((_value as int)));
       } else if (_value is double) {
         return valueOf3(((leftValue as int)).toDouble() % ((_value as double)));
       }
     } else if (leftValue is double) {
       if (_value is int) {
         return valueOf3(((leftValue as double)) % ((_value as int)).toDouble());
       } else if (_value is double) {
         return valueOf3(((leftValue as double)) % ((_value as double)));
       }
     }
     return error(node);
   }
   EvaluationResultImpl shiftLeftError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl shiftLeftValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeInt() || leftOperand2.isSomeInt()) {
+      if (isAnyInt() && leftOperand2.isAnyInt()) {
+        return RESULT_INT;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_INT);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         return valueOf(((leftValue as int)) << ((_value as int)));
       }
       return error(node.rightOperand);
     }
     if (_value is int) {
       return error(node.leftOperand);
     }
     return union(error(node.leftOperand), error(node.rightOperand));
   }
   EvaluationResultImpl shiftRightError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl shiftRightValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeInt() || leftOperand2.isSomeInt()) {
+      if (isAnyInt() && leftOperand2.isAnyInt()) {
+        return RESULT_INT;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_INT);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         return valueOf(((leftValue as int)) >> ((_value as int)));
       }
       return error(node.rightOperand);
     }
     if (_value is int) {
       return error(node.leftOperand);
     }
     return union(error(node.leftOperand), error(node.rightOperand));
   }
   EvaluationResultImpl timesError(BinaryExpression node, ErrorResult leftOperand) => leftOperand;
   EvaluationResultImpl timesValid(BinaryExpression node, ValidResult leftOperand2) {
+    if (isSomeNum() || leftOperand2.isSomeNum()) {
+      if (isAnyNum() && leftOperand2.isAnyNum()) {
+        return RESULT_NUM;
+      }
+      return error2(node, CompileTimeErrorCode.CONST_EVAL_TYPE_NUM);
+    }
     Object leftValue = leftOperand2.value;
     if (leftValue == null) {
       return error(node.leftOperand);
     } else if (_value == null) {
       return error(node.rightOperand);
     } else if (leftValue is int) {
       if (_value is int) {
         return valueOf(((leftValue as int)) * (_value as int));
       } else if (_value is double) {
         return valueOf3(((leftValue as int)).toDouble() * ((_value as double)));
       }
     } else if (leftValue is double) {
       if (_value is int) {
         return valueOf3(((leftValue as double)) * ((_value as int)).toDouble());
       } else if (_value is double) {
         return valueOf3(((leftValue as double)) * ((_value as double)));
       }
     }
     return error(node);
   }
+  bool isNull() => identical(this, RESULT_NULL);
+  
   /**
    * Return the result of applying boolean conversion to the given value.
    * @param node the node against which errors should be reported
    * @param value the value to be converted to a boolean
    * @return the result of applying boolean conversion to the given value
    */
   EvaluationResultImpl booleanConversion(ASTNode node, Object value) {
-    if (value == null) {
-      return error(node);
-    } else if (value is bool && ((value as bool))) {
-      return RESULT_TRUE;
+    if (value is bool) {
+      if (((value as bool))) {
+        return RESULT_TRUE;
+      } else {
+        return RESULT_FALSE;
+      }
     }
-    return RESULT_FALSE;
+    return error(node);
   }
   ErrorResult error(ASTNode node) => error2(node, CompileTimeErrorCode.INVALID_CONSTANT);
+  
   /**
    * Return a result object representing an error associated with the given node.
    * @param node the AST node associated with the error
    * @param code the error code indicating the nature of the error
    * @return a result object representing an error associated with the given node
    */
   ErrorResult error2(ASTNode node, ErrorCode code) => new ErrorResult.con1(node, code);
+  
+  /**
+   * Checks if this result has type "bool", with known or unknown value.
+   */
+  bool isAnyBool() => isSomeBool() || identical(this, RESULT_TRUE) || identical(this, RESULT_FALSE);
+  
+  /**
+   * Checks if this result has type "int", with known or unknown value.
+   */
+  bool isAnyInt() => identical(this, RESULT_INT) || _value is int;
+  
+  /**
+   * Checks if this result has one of the types - "bool", "num" or "string"; or may be {@code null}.
+   */
+  bool isAnyNullBoolNumString() => isNull() || isAnyBool() || isAnyNum() || _value is String;
+  
+  /**
+   * Checks if this result has type "num", with known or unknown value.
+   */
+  bool isAnyNum() => isSomeNum() || _value is num;
+  
+  /**
+   * Checks if this result has type "bool", exact value of which we don't know.
+   */
+  bool isSomeBool() => identical(this, RESULT_BOOL);
+  
+  /**
+   * Checks if this result has type "int", exact value of which we don't know.
+   */
+  bool isSomeInt() => identical(this, RESULT_INT);
+  
+  /**
+   * Checks if this result has type "num" (or "int"), exact value of which we don't know.
+   */
+  bool isSomeNum() => identical(this, RESULT_DYNAMIC) || identical(this, RESULT_INT) || identical(this, RESULT_NUM);
   double toDouble(int value) => value.toDouble();
+  
   /**
    * Return an error result that is the union of the two given error results.
    * @param firstError the first error to be combined
    * @param secondError the second error to be combined
    * @return an error result that is the union of the two given error results
    */
   ErrorResult union(ErrorResult firstError, ErrorResult secondError) => new ErrorResult.con2(firstError, secondError);
+  
   /**
    * Return a result object representing the given value.
    * @param value the value to be represented as a result object
    * @return a result object representing the given value
    */
   ValidResult valueOf(int value) => new ValidResult(value);
+  
   /**
    * Return a result object representing the given value.
    * @param value the value to be represented as a result object
    * @return a result object representing the given value
    */
   ValidResult valueOf2(bool value) => value ? RESULT_TRUE : RESULT_FALSE;
+  
   /**
    * Return a result object representing the given value.
    * @param value the value to be represented as a result object
    * @return a result object representing the given value
    */
   ValidResult valueOf3(double value) => new ValidResult(value);
+  
   /**
    * Return a result object representing the given value.
    * @param value the value to be represented as a result object
    * @return a result object representing the given value
    */
   ValidResult valueOf4(String value) => new ValidResult(value);
 }