Report compile time errors when assert initializers fail.

pkg/analyzer/lib/src/dart/constant/evaluation.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.dart.constant.evaluation;
 
 import 'dart:collection';
 
 import 'package:analyzer/context/declared_variables.dart';
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 688 matching lines @@
         String name = baseParameter.name;
         parameterMap[name] = argumentValue;
       }
     }
     ConstantVisitor initializerVisitor = new ConstantVisitor(
         this, externalErrorReporter,
         lexicalEnvironment: parameterMap);
     String superName = null;
     NodeList<Expression> superArguments = null;
     for (ConstructorInitializer initializer in initializers) {
-      if (initializer is ConstructorFieldInitializer) {
+      if (initializer is AssertInitializer) {
+        Expression condition = initializer.condition;
+        DartObjectImpl conditionResult = condition?.accept(initializerVisitor);
+        if (conditionResult != null) {
+          if (conditionResult.isBool) {
+            if (!conditionResult.toBoolValue()) {
+              errorReporter.reportErrorForNode(
+                  CompileTimeErrorCode.CONST_EVAL_THROWS_ASSERT_FALSE, node);
+            }
+          } else {
+            errorReporter.reportErrorForNode(
+                CompileTimeErrorCode.CONST_EVAL_THROWS_ASSERT_NOT_BOOL, node);
+          }
+        } else {
+          errorReporter.reportErrorForNode(
+              CompileTimeErrorCode.CONST_EVAL_THROWS_EXCEPTION, node);
+        }
+      } else if (initializer is ConstructorFieldInitializer) {
         Expression initializerExpression = initializer.expression;
         DartObjectImpl evaluationResult =
             initializerExpression?.accept(initializerVisitor);
         if (evaluationResult != null) {
           String fieldName = initializer.fieldName.name;
           if (fieldMap.containsKey(fieldName)) {
             errorReporter.reportErrorForNode(
                 CompileTimeErrorCode.CONST_EVAL_THROWS_EXCEPTION, node);
           }
           fieldMap[fieldName] = evaluationResult;
@@ skipping 1413 matching lines @@
   }
 
   @override
   String toString() {
     if (value == null) {
       return "error";
     }
     return value.toString();
   }
 }