Add support for assert statements with messages to the analyzer.

pkg/analyzer/lib/src/generated/error.dart

Index: pkg/analyzer/lib/src/generated/error.dart
diff --git a/pkg/analyzer/lib/src/generated/error.dart b/pkg/analyzer/lib/src/generated/error.dart
index 93d1ce8dd482f5e2609772ff409387a1386a3766..c697d28a1c10c3b28cd16faa6b2538f549a0380f 100644
--- a/pkg/analyzer/lib/src/generated/error.dart
+++ b/pkg/analyzer/lib/src/generated/error.dart
@@ -28,14 +28,15 @@ class AnalysisError {
    * was found.
    */
   static Comparator<AnalysisError> FILE_COMPARATOR = (AnalysisError o1,
-      AnalysisError o2) => o1.source.shortName.compareTo(o2.source.shortName);
+          AnalysisError o2) =>
+      o1.source.shortName.compareTo(o2.source.shortName);
 
   /**
    * A [Comparator] that sorts error codes first by their severity (errors
    * first, warnings second), and then by the the error code type.
    */
-  static Comparator<AnalysisError> ERROR_CODE_COMPARATOR = (AnalysisError o1,
-      AnalysisError o2) {
+  static Comparator<AnalysisError> ERROR_CODE_COMPARATOR =
+      (AnalysisError o1, AnalysisError o2) {
     ErrorCode errorCode1 = o1.errorCode;
     ErrorCode errorCode2 = o2.errorCode;
     ErrorSeverity errorSeverity1 = errorCode1.errorSeverity;
@@ -1560,7 +1561,8 @@ class CompileTimeErrorCode extends ErrorCode {
    * 0: the name of the constant that is missing
    */
   static const CompileTimeErrorCode MISSING_ENUM_CONSTANT_IN_SWITCH =
-      const CompileTimeErrorCode('MISSING_ENUM_CONSTANT_IN_SWITCH',
+      const CompileTimeErrorCode(
+          'MISSING_ENUM_CONSTANT_IN_SWITCH',
           "Missing case clause for '{0}'",
           "Add a case clause for the missing constant or add a default clause.");
 
@@ -1596,7 +1598,8 @@ class CompileTimeErrorCode extends ErrorCode {
    * https://code.google.com/p/dart/issues/detail?id=15101#c4
    */
   static const CompileTimeErrorCode MIXIN_HAS_NO_CONSTRUCTORS =
-      const CompileTimeErrorCode('MIXIN_HAS_NO_CONSTRUCTORS',
+      const CompileTimeErrorCode(
+          'MIXIN_HAS_NO_CONSTRUCTORS',
           "This mixin application is invalid because all of the constructors "
           "in the base class '{0}' have optional parameters.");
 
@@ -2885,7 +2888,8 @@ class HintCode extends ErrorCode {
    * Parameters:
    * 0: the name of the declared return type
    */
-  static const HintCode MISSING_RETURN = const HintCode('MISSING_RETURN',
+  static const HintCode MISSING_RETURN = const HintCode(
+      'MISSING_RETURN',
       "This function declares a return type of '{0}', but does not end with a return statement",
       "Either add a return statement or change the return type to 'void'");
 
@@ -3203,6 +3207,14 @@ class LintCode extends ErrorCode {
  */
 class StaticTypeWarningCode extends ErrorCode {
   /**
+   * 17.17 Assert:  It is a static type warning if the type of s may not be
+   * assigned to String.
+   */
+  static const StaticTypeWarningCode ASSERT_MESSAGE_NON_STRING =
+      const StaticTypeWarningCode('ASSERT_MESSAGE_NON_STRING',
+          "Assertion messages must be assignable to String");
+
+  /**
    * 12.7 Lists: A fresh instance (7.6.1) <i>a</i>, of size <i>n</i>, whose
    * class implements the built-in class <i>List&lt;E></i> is allocated.
    *
@@ -3728,7 +3740,8 @@ class StaticWarningCode extends ErrorCode {
    * 2: the name of the second library that the type is found
    */
   static const StaticWarningCode AMBIGUOUS_IMPORT = const StaticWarningCode(
-      'AMBIGUOUS_IMPORT', "The name '{0}' is defined in the libraries {1}",
+      'AMBIGUOUS_IMPORT',
+      "The name '{0}' is defined in the libraries {1}",
       "Consider using 'as prefix' for one of the import directives "
       "or hiding the name from all but one of the imports.");