dead code elimination in reify_coercions

lib/src/info.dart

Index: lib/src/info.dart
diff --git a/lib/src/info.dart b/lib/src/info.dart
index d235807a394a64fede651d0497e6e7cce23e426d..2c7730b5a1f332ff29da4fc6cdedb86b051c968a 100644
--- a/lib/src/info.dart
+++ b/lib/src/info.dart
@@ -653,57 +653,13 @@ class InvalidSuperInvocation extends StaticError {
       "(see http://goo.gl/q1T4BB): $node";
 }
 
-/// Calls into the runtime support library
-class RuntimeOperation extends Expression {
-  final List<Expression> arguments;
-  final String operation;
-  Token opToken;
-
-  RuntimeOperation(this.operation, this.arguments) {
-    opToken = new SyntheticStringToken(TokenType.IDENTIFIER, this.operation, 0);
-  }
-
-  Token get beginToken => opToken;
-  Token get endToken => opToken;
-
-  @override
-  accept(AstVisitor visitor) {
-    if (visitor is ConversionVisitor) {
-      return visitor.visitRuntimeOperation(this);
-    } else if (visitor is AstCloner) {
-      var l = arguments.map((e) => e.accept(visitor)).toList();
-      return new RuntimeOperation(operation, l);
-    } else {
-      visitChildren(visitor);
-    }
-  }
-
-  @override
-  void visitChildren(AstVisitor visitor) {
-    arguments.forEach((e) => e.accept(visitor));
-  }
-
-  // Use same precedence as MethodInvocation.
-  int get precedence => 15;
-
-  @override
-  Iterable get childEntities => new ChildEntities()
-    ..add(opToken)
-    ..addAll(arguments);
-}
-
 /// A simple generalizing visitor interface for the conversion nodes.
 /// This can be mixed in to your visitor if the AST can contain these nodes.
-/// TODO(leafp): Rename to something appropriate if RuntimeOperation stays
-/// around
 abstract class ConversionVisitor<R> implements AstVisitor<R> {
   /// This method must be implemented. It is typically supplied by the base
   /// GeneralizingAstVisitor<R>.
   R visitNode(AstNode node);
 
-  // Handle runtime operations
-  R visitRuntimeOperation(RuntimeOperation node) => visitNode(node);
-
   /// The catch-all for any kind of conversion
   R visitConversion(Conversion node) => visitNode(node);