Handle fields with initializers in constant constructors.

pkg/compiler/lib/src/compile_time_constants.dart

Index: pkg/compiler/lib/src/compile_time_constants.dart
diff --git a/pkg/compiler/lib/src/compile_time_constants.dart b/pkg/compiler/lib/src/compile_time_constants.dart
index 71962e88957bcc163fdc0d7df455753022b6ab8c..1c066ed2c0485add0ec9bd279654610dc58306a5 100644
--- a/pkg/compiler/lib/src/compile_time_constants.dart
+++ b/pkg/compiler/lib/src/compile_time_constants.dart
@@ -414,7 +414,10 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
   AstConstant evaluate(Node node) {
     // TODO(johnniwinther): should there be a visitErrorNode?
     if (node is ErrorNode) return new ErroneousAstConstant(context, node);
-    return node.accept(this);
+    AstConstant result = node.accept(this);
+    assert(invariant(node, !isEvaluatingConstant || result != null,
+        message: "No AstConstant computed for the node."));
+    return result;
   }
 
   AstConstant evaluateConstant(Node node) {
@@ -422,7 +425,8 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
     isEvaluatingConstant = true;
     AstConstant result = node.accept(this);
     isEvaluatingConstant = oldIsEvaluatingConstant;
-    assert(result != null);
+    assert(invariant(node, result != null,
+        message: "No AstConstant computed for the node."));
     return result;
   }
 
@@ -461,8 +465,8 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
         !link.isEmpty;
         link = link.tail) {
       AstConstant argument = evaluateConstant(link.head);
-      if (argument == null) {
-        return null;
+      if (argument == null || argument.isError) {
+        return argument;
       }
       argumentExpressions.add(argument.expression);
       argumentValues.add(argument.value);
@@ -488,12 +492,12 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
         link = link.tail) {
       LiteralMapEntry entry = link.head;
       AstConstant key = evaluateConstant(entry.key);
-      if (key == null) {
-        return null;
+      if (key == null || key.isError) {
+        return key;
       }
       AstConstant value = evaluateConstant(entry.value);
-      if (value == null) {
-        return null;
+      if (value == null || value.isError) {
+        return value;
       }
       if (!map.containsKey(key.value)) {
         keyValues.add(key.value);
@@ -530,7 +534,12 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
   AstConstant visitStringJuxtaposition(StringJuxtaposition node) {
     AstConstant left = evaluate(node.first);
     AstConstant right = evaluate(node.second);
-    if (left == null || right == null) return null;
+    if (left == null || left.isError) {
+      return left;
+    }
+    if (right == null || right.isError) {
+      return right;
+    }
     StringConstantValue leftValue = left.value;
     StringConstantValue rightValue = right.value;
     return new AstConstant(
@@ -544,16 +553,16 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
   AstConstant visitStringInterpolation(StringInterpolation node) {
     List<ConstantExpression> subexpressions = <ConstantExpression>[];
     AstConstant initialString = evaluate(node.string);
-    if (initialString == null) {
-      return null;
+    if (initialString == null || initialString.isError) {
+      return initialString;
     }
     subexpressions.add(initialString.expression);
     StringConstantValue initialStringValue = initialString.value;
     DartString accumulator = initialStringValue.primitiveValue;
     for (StringInterpolationPart part in node.parts) {
       AstConstant subexpression = evaluate(part.expression);
-      if (subexpression == null) {
-        return null;
+      if (subexpression == null || subexpression.isError) {
+        return subexpression;
       }
       subexpressions.add(subexpression.expression);
       ConstantValue expression = subexpression.value;
@@ -578,7 +587,6 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
       accumulator =
           new DartString.concat(accumulator, partStringValue.primitiveValue);
     }
-    ;
     return new AstConstant(
         context,
         node,
@@ -725,8 +733,8 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
     } else if (send.isPrefix) {
       assert(send.isOperator);
       AstConstant receiverConstant = evaluate(send.receiver);
-      if (receiverConstant == null) {
-        return null;
+      if (receiverConstant == null || receiverConstant.isError) {
+        return receiverConstant;
       }
       Operator node = send.selector;
       UnaryOperator operator = UnaryOperator.parse(node.source);
@@ -747,8 +755,11 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
       assert(send.argumentCount() == 1);
       AstConstant left = evaluate(send.receiver);
       AstConstant right = evaluate(send.argumentsNode.nodes.head);
-      if (left == null || right == null) {
-        return null;
+      if (left == null || left.isError) {
+        return left;
+      }
+      if (right == null || right.isError) {
+        return right;
       }
       ConstantValue leftValue = left.value;
       ConstantValue rightValue = right.value;
@@ -796,8 +807,8 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
 
   AstConstant visitConditional(Conditional node) {
     AstConstant condition = evaluate(node.condition);
-    if (condition == null) {
-      return null;
+    if (condition == null || condition.isError) {
+      return condition;
     } else if (!condition.value.isBool) {
       DartType conditionType = condition.value.getType(coreTypes);
       if (isEvaluatingConstant) {
@@ -809,8 +820,11 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
     }
     AstConstant thenExpression = evaluate(node.thenExpression);
     AstConstant elseExpression = evaluate(node.elseExpression);
-    if (thenExpression == null || elseExpression == null) {
-      return null;
+    if (thenExpression == null || thenExpression.isError) {
+      return thenExpression;
+    }
+    if (elseExpression == null || elseExpression.isError) {
+      return elseExpression;
     }
     BoolConstantValue boolCondition = condition.value;
     return new AstConstant(
@@ -978,48 +992,43 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
     ConstantValue defaultValue = normalizedArguments[1].value;
 
     if (firstArgument.isNull) {
-      reporter.reportErrorMessage(
+      return reportNotCompileTimeConstant(
           normalizedArguments[0].node, MessageKind.NULL_NOT_ALLOWED);
-      return null;
     }
 
     if (!firstArgument.isString) {
       DartType type = defaultValue.getType(coreTypes);
-      reporter.reportErrorMessage(
+      return reportNotCompileTimeConstant(
           normalizedArguments[0].node,
           MessageKind.NOT_ASSIGNABLE,
           {'fromType': type, 'toType': coreTypes.stringType});
-      return null;
     }
 
     if (constructor.isIntFromEnvironmentConstructor &&
         !(defaultValue.isNull || defaultValue.isInt)) {
       DartType type = defaultValue.getType(coreTypes);
-      reporter.reportErrorMessage(
+      return reportNotCompileTimeConstant(
           normalizedArguments[1].node,
           MessageKind.NOT_ASSIGNABLE,
           {'fromType': type, 'toType': coreTypes.intType});
-      return null;
     }
 
     if (constructor.isBoolFromEnvironmentConstructor &&
         !(defaultValue.isNull || defaultValue.isBool)) {
       DartType type = defaultValue.getType(coreTypes);
-      reporter.reportErrorMessage(
+      return reportNotCompileTimeConstant(
           normalizedArguments[1].node,
           MessageKind.NOT_ASSIGNABLE,
           {'fromType': type, 'toType': coreTypes.boolType});
-      return null;
     }
 
     if (constructor.isStringFromEnvironmentConstructor &&
         !(defaultValue.isNull || defaultValue.isString)) {
       DartType type = defaultValue.getType(coreTypes);
-      reporter.reportErrorMessage(
+      return reportNotCompileTimeConstant(
           normalizedArguments[1].node,
           MessageKind.NOT_ASSIGNABLE,
           {'fromType': type, 'toType': coreTypes.stringType});
-      return null;
     }
 
     String name = firstArgument.primitiveValue.slowToString();
@@ -1103,6 +1112,11 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
     fieldConstants.forEach((FieldElement field, AstConstant astConstant) {
       fieldValues[field] = astConstant.value;
     });
+    for (AstConstant fieldValue in fieldConstants.values) {
+      if (fieldValue.isError) {
+        return fieldValue;
+      }
+    }
     return new AstConstant(
         context,
         node,
@@ -1115,13 +1129,18 @@ class CompileTimeConstantEvaluator extends Visitor<AstConstant> {
     return node.expression.accept(this);
   }
 
+  AstConstant reportNotCompileTimeConstant(Node node, MessageKind message,
+      [Map arguments = const {}]) {
+    reporter.reportErrorMessage(node, message, arguments);
+    return new AstConstant(context, node, new ErroneousConstantExpression(),
+        new NullConstantValue());
+  }
+
   AstConstant signalNotCompileTimeConstant(Node node,
-      {MessageKind message: MessageKind.NOT_A_COMPILE_TIME_CONSTANT}) {
+      {MessageKind message: MessageKind.NOT_A_COMPILE_TIME_CONSTANT,
+      Map arguments: const {}}) {
     if (isEvaluatingConstant) {
-      reporter.reportErrorMessage(node, message);
-
-      return new AstConstant(context, node, new ErroneousConstantExpression(),
-          new NullConstantValue());
+      return reportNotCompileTimeConstant(node, message, arguments);
     }
     // Else we don't need to do anything. The final handler is only
     // optimistically trying to compile constants. So it is normal that we
@@ -1372,6 +1391,8 @@ class AstConstant {
         value);
   }
 
+  bool get isError => expression.kind == ConstantExpressionKind.ERRONEOUS;
+
   String toString() => expression.toString();
 }