[es6] implement destructuring assignment

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 e38b444699bb01af8a9079a60767f40f8efe604d..02d719abbba1de88dd57e561e1dd1e19e7ecd424 100644
--- a/src/ast-expression-visitor.cc
+++ b/src/ast-expression-visitor.cc
@@ -230,6 +230,12 @@ void AstExpressionVisitor::VisitRegExpLiteral(RegExpLiteral* expr) {
 }
 
 
+void AstExpressionVisitor::VisitAssignmentPattern(AssignmentPattern* expr) {
+  VisitExpression(expr);
+  RECURSE_EXPRESSION(Visit(expr->expression()));

[adamk, 2015/11/20 22:42:58]

For each visitor, how did you decide whether to visit the expression vs the
pattern? This is another reason why it would make more sense to handle this in
VisitAssignment, it's sort of meaningless to visit an assignment pattern without
more context.

+}
+
+
 void AstExpressionVisitor::VisitObjectLiteral(ObjectLiteral* expr) {
   VisitExpression(expr);
   ZoneList<ObjectLiteralProperty*>* props = expr->properties();