Implement line and column numbers.

pkg/front_end/lib/src/fasta/source/source_library_builder.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.source_library_builder;
 
 import 'package:kernel/ast.dart' show
     AsyncMarker,
     ProcedureKind;
 
 import '../combinator.dart' show
     Combinator;
 
 import '../errors.dart' show
     internalError;
 
+import '../messages.dart' show
+    warning;
+
 import '../import.dart' show
     Import;
 
 import 'source_loader.dart' show
     SourceLoader;
 
 import '../builder/scope.dart' show
     Scope;
 
 import '../builder/builder.dart' show
@@ skipping 268 matching lines @@
 
   void includeParts() {
     for (SourceLibraryBuilder<T, R> part in parts.toList()) {
       includePart(part);
     }
   }
 
   void includePart(SourceLibraryBuilder<T, R> part) {
     if (name != null) {
       if (part.partOf == null) {
-        print("${part.uri} has no 'part of' declaration but is used as a part "
-            "by ${name} ($uri)");
+        warning(part.fileUri, -1, "Has no 'part of' declaration but is used as "
+            "a part by ${name} ($uri).");
         parts.remove(part);
         return;
       }
       if (part.partOf != name) {
-        print("${part.uri} is part of '${part.partOf}' but is used as a part "
-            "by '${name}' ($uri)");
+        warning(part.fileUri, -1, "Is part of '${part.partOf}' but is used as "
+            "a part by '${name}' ($uri).");
         parts.remove(part);
         return;
       }
     }
     part.members.forEach((String name, Builder builder) {
       if (builder.next != null) {
         assert(builder.next.next == null);
         addBuilder(name, builder.next, builder.next.charOffset);
       }
       addBuilder(name, builder, builder.charOffset);
@@ skipping 146 matching lines @@
   }
 
   /// Called to register [procedure] as a factory whose types are collected in
   /// [factoryDeclaration]. Later, once the class has been built, we can
   /// synthesize type variables on the factory matching the class'.
   void addFactoryDeclaration(
       ProcedureBuilder procedure, DeclarationBuilder<T> factoryDeclaration) {
     factoryDeclarations[procedure] = factoryDeclaration;
   }
 }