Use FastaMessage instead of String. Part 1.

pkg/front_end/lib/src/fasta/kernel/fasta_accessors.dart

 // Copyright (c) 2016, 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 fasta.fasta_accessors;
 
-import 'package:front_end/src/fasta/kernel/kernel_shadow_ast.dart'
+import 'package:kernel/ast.dart'
+    hide InvalidExpression, InvalidInitializer, InvalidStatement;
+
+import '../../scanner/token.dart' show Token;
+
+import '../deprecated_problems.dart' show deprecated_internalProblem;
+
+import '../messages.dart' show Message;
+
+import '../names.dart' show callName, lengthName;
+
+import '../scope.dart'
+    show deprecated_AccessErrorBuilder, ProblemBuilder, Scope;
+
+import '../type_inference/type_promotion.dart' show TypePromoter;
+
+import 'kernel_shadow_ast.dart'
     show
         KernelArguments,
         KernelComplexAssignment,
         KernelIndexAssign,
         KernelPropertyAssign,
         KernelStaticAssignment,
         KernelThisExpression,
         KernelTypeLiteral,
         KernelVariableAssignment;
 
-import 'package:front_end/src/fasta/kernel/utils.dart' show offsetForToken;
-
-import 'package:front_end/src/scanner/token.dart' show Token;
+import 'utils.dart' show offsetForToken;
 
 import 'frontend_accessors.dart' show Accessor;
 
-import 'package:front_end/src/fasta/type_inference/type_promotion.dart'
-    show TypePromoter;
-
-import 'package:kernel/ast.dart'
-    hide InvalidExpression, InvalidInitializer, InvalidStatement;
-
-import '../deprecated_problems.dart' show deprecated_internalProblem;
-
-import '../scope.dart'
-    show deprecated_AccessErrorBuilder, ProblemBuilder, Scope;
-
 import 'frontend_accessors.dart' as kernel
     show
         IndexAccessor,
         NullAwarePropertyAccessor,
         PropertyAccessor,
         ReadOnlyAccessor,
         StaticAccessor,
         SuperIndexAccessor,
         SuperPropertyAccessor,
         ThisIndexAccessor,
         ThisPropertyAccessor,
         VariableAccessor;
 
 import 'kernel_builder.dart'
     show
         Builder,
         KernelClassBuilder,
         KernelInvalidTypeBuilder,
         LibraryBuilder,
         PrefixBuilder,
         TypeDeclarationBuilder;
 
-import '../names.dart' show callName, lengthName;
-
 abstract class BuilderHelper {
   LibraryBuilder get library;
 
   Uri get uri;
 
   TypePromoter get typePromoter;
 
   int get functionNestingLevel;
 
   bool get constantExpressionRequired;
 
   Constructor lookupConstructor(Name name, {bool isSuper});
 
   Expression toSuperMethodInvocation(MethodInvocation node);
 
   Expression toValue(node);
 
   Member lookupSuperMember(Name name, {bool isSetter});
 
   scopeLookup(Scope scope, String name, Token token,
       {bool isQualified: false, PrefixBuilder prefix});
 
   finishSend(Object receiver, Arguments arguments, int offset);
 
-  Expression deprecated_buildCompileTimeError(error, [int offset]);
+  Expression buildCompileTimeError(Message message, int charOffset);
+
+  Expression deprecated_buildCompileTimeError(String error, [int offset]);
 
   Initializer buildInvalidInitializer(Expression expression, [int offset]);
 
   Initializer buildFieldInitializer(
       String name, int offset, Expression expression);
 
   Initializer buildSuperInitializer(
       Constructor constructor, Arguments arguments,
       [int offset]);
 
@@ skipping 950 matching lines @@
     offset ??= offsetForToken(this.token);
     return helper.throwNoSuchMethodError(new NullLiteral()..fileOffset = offset,
         plainNameForRead, arguments, offset,
         isGetter: isGetter, isSetter: isSetter);
   }
 }
 
 bool isFieldOrGetter(Member member) {
   return member is Field || (member is Procedure && member.isGetter);
 }