[es6] Re-implement rest parameters via desugaring.

src/ast-expression-visitor.cc

Index: src/ast-expression-visitor.cc
diff --git a/src/ast-expression-visitor.cc b/src/ast-expression-visitor.cc
index 5a0912576155dd64cdde5556574a8281a1889a7a..1f6bddcdd895b54297057e03cf92c5924eb7b050 100644
--- a/src/ast-expression-visitor.cc
+++ b/src/ast-expression-visitor.cc
@@ -203,6 +203,11 @@ void AstExpressionVisitor::VisitVariableProxy(VariableProxy* expr) {
 }
 
 
+void AstExpressionVisitor::VisitRestParameter(RestParameter* expr) {

[adamk, 2015/08/28 23:26:37]

Why isn't this one UNREACHABLE()?

[caitp (gmail), 2015/08/28 23:58:01]

I wasn't sure if AstExpressionVisitor was ever used before compilation or not.
Sounds like it isn't, so I guess it can probably be UNREACHABLE

[caitp (gmail), 2015/08/29 15:51:59]

All the AST node stuff is now gone, replaced with the use of the mutable
qualifier

+  VisitExpression(expr);
+}
+
+
 void AstExpressionVisitor::VisitLiteral(Literal* expr) {
   VisitExpression(expr);
 }