Use Feature directly in resolution.

pkg/compiler/lib/src/common/resolution.dart

 
 // Copyright (c) 2012, 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 dart2js.common.resolution;
 
 import '../common.dart';
 import '../compiler.dart' show
     Compiler;
+import '../constants/expressions.dart' show
+    ConstantExpression;
 import '../core_types.dart' show
     CoreTypes;
 import '../dart_types.dart' show
     DartType,
     InterfaceType;
 import '../elements/elements.dart' show
     AstElement,
     ClassElement,
     Element,
     ErroneousElement,
@@ skipping 31 matching lines @@
     _isAnalyzed = true;
     return impact;
   }
 
   bool get isAnalyzed => _isAnalyzed;
 }
 
 class ResolutionImpact extends WorldImpact {
   const ResolutionImpact();
 
-  // TODO(johnniwinther): Remove this.
-  void registerDependency(Element element) {}
-
   Iterable<Feature> get features => const <Feature>[];
-  Iterable<DartType> get requiredTypes => const <DartType>[];
   Iterable<MapLiteralUse> get mapLiterals => const <MapLiteralUse>[];
   Iterable<ListLiteralUse> get listLiterals => const <ListLiteralUse>[];
-  Iterable<DartType> get typeLiterals => const <DartType>[];
   Iterable<String> get constSymbolNames => const <String>[];
+  Iterable<ConstantExpression> get constantLiterals {
+    return const <ConstantExpression>[];
+  }
 }
 
 /// A language feature seen during resolution.
 // TODO(johnniwinther): Should mirror usage be part of this?
 enum Feature {
   /// Invocation of a generative construction on an abstract class.
   ABSTRACT_CLASS_INSTANTIATION,
   /// An assert statement with no message.
   ASSERT,
   /// An assert statement with a message.
@@ skipping 11 matching lines @@
   /// A fall through in a switch case.
   FALL_THROUGH_ERROR,
   /// A ++/-- operation.
   INC_DEC_OPERATION,
   /// A field whose initialization is not a constant.
   LAZY_FIELD,
   /// A catch clause with a variable for the stack trace.
   STACK_TRACE_IN_CATCH,
   /// String interpolation.
   STRING_INTERPOLATION,
+  /// String juxtaposition.
+  STRING_JUXTAPOSITION,
   /// An implicit call to `super.noSuchMethod`, like calling an unresolved
   /// super method.
   SUPER_NO_SUCH_METHOD,
   /// A redirection to the `Symbol` constructor.
   SYMBOL_CONSTRUCTOR,
   /// An synchronous for in statement, like `for (var e in i) {}`.
   SYNC_FOR_IN,
   /// A method with a `sync*` body modifier.
   SYNC_STAR,
   /// A throw expression.
@@ skipping 76 matching lines @@
   WorldImpact computeWorldImpact(Element element);
 }
 
 // TODO(johnniwinther): Rename to `Parser` or `ParsingContext`.
 abstract class Parsing {
   DiagnosticReporter get reporter;
   void parsePatchClass(ClassElement cls);
   measure(f());
   ScannerOptions getScannerOptionsFor(Element element);
 }