Handle prefix as expression in SendSet.

pkg/compiler/lib/src/resolution/members.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.resolution.members;
 
 import '../common.dart';
 import '../common/names.dart' show
     Selectors;
 import '../common/resolution.dart' show
@@ skipping 2997 matching lines @@
     }
     if (element.isClass) {
       // `C = b`, `C++`, or 'C += b` where 'C' is a class.
       return handleClassTypeLiteralUpdate(node, name, element);
     } else if (element.isTypedef) {
       // `C = b`, `C++`, or 'C += b` where 'F' is a typedef.
       return handleTypedefTypeLiteralUpdate(node, name, element);
     } else if (element.isTypeVariable) {
       // `T = b`, `T++`, or 'T += b` where 'T' is a type variable.
       return handleTypeVariableTypeLiteralUpdate(node, name, element);
+    } else if (element.isPrefix) {
+      // `p = b` where `p` is a prefix.
+      ErroneousElement error = reportAndCreateErroneousElement(
+           node,
+           name.text,
+           MessageKind.PREFIX_AS_EXPRESSION,
+           {'prefix': name},
+           isError: true);
+      registry.registerFeature(Feature.COMPILE_TIME_ERROR);
+      return handleUpdate(
+          node, name, new StaticAccess.invalid(error));
     } else if (element.isLocal) {
       return handleLocalUpdate(node, name, element);
     } else if (element.isStatic || element.isTopLevel) {
       return handleStaticOrTopLevelUpdate(node, name, element);
     }
     return reporter.internalError(node, "Unexpected resolved send: $element");
   }
 
   /// Handle an unqualified [Send], that is where the `node.receiver` is null,
   /// like `a`, `a()`, `this()`, `assert()`, and `(){}()`.
@@ skipping 1803 matching lines @@
     }
     return const NoneResult();
   }
 }
 
 /// Looks up [name] in [scope] and unwraps the result.
 Element lookupInScope(DiagnosticReporter reporter, Node node,
                       Scope scope, String name) {
   return Elements.unwrap(scope.lookup(name), reporter, node);
 }