[es6] support rest parameters in arrow functions (alternative)

src/typing.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/typing.h"
 
 #include "src/frames.h"
 #include "src/frames-inl.h"
 #include "src/ostreams.h"
 #include "src/parser.h"  // for CompileTimeValue; TODO(rossberg): should move
@@ skipping 751 matching lines @@
   NarrowLowerType(expr->right(), right_type);
   expr->set_combined_type(combined_type);
 
   RECURSE(Visit(expr->left()));
   RECURSE(Visit(expr->right()));
 
   NarrowType(expr, Bounds(Type::Boolean(zone())));
 }
 
 
+void AstTyper::VisitSpread(Spread* expr) {
+  UNREACHABLE();
+}
+
+
 void AstTyper::VisitThisFunction(ThisFunction* expr) {
 }
 
 
 void AstTyper::VisitSuperReference(SuperReference* expr) {}
 
 
 void AstTyper::VisitDeclarations(ZoneList<Declaration*>* decls) {
   for (int i = 0; i < decls->length(); ++i) {
     Declaration* decl = decls->at(i);
@@ skipping 37 matching lines @@
 void AstTyper::VisitModuleUrl(ModuleUrl* module) {
 }
 
 
 void AstTyper::VisitModuleStatement(ModuleStatement* stmt) {
   RECURSE(Visit(stmt->body()));
 }
 
 
 } }  // namespace v8::internal