[es6] Re-implement rest parameters via desugaring.

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 353 matching lines @@
 
 
 void AstTyper::VisitVariableProxy(VariableProxy* expr) {
   Variable* var = expr->var();
   if (var->IsStackAllocated()) {
     NarrowType(expr, store_.LookupBounds(variable_index(var)));
   }
 }
 
 
+void AstTyper::VisitRestParameter(RestParameter* node) {
+  // This node should be evicted from the tree before typing ever occurs.
+  UNREACHABLE();
+}
+
+
 void AstTyper::VisitLiteral(Literal* expr) {
   Type* type = Type::Constant(expr->value(), zone());
   NarrowType(expr, Bounds(type));
 }
 
 
 void AstTyper::VisitRegExpLiteral(RegExpLiteral* expr) {
   // TODO(rossberg): Reintroduce RegExp type.
   NarrowType(expr, Bounds(Type::Object(zone())));
 }
@@ skipping 393 matching lines @@
 void AstTyper::VisitImportDeclaration(ImportDeclaration* declaration) {
 }
 
 
 void AstTyper::VisitExportDeclaration(ExportDeclaration* declaration) {
 }
 
 
 }  // namespace internal
 }  // namespace v8