Parse arrow functions at proper precedence level

src/prettyprinter.cc

Index: src/prettyprinter.cc
diff --git a/src/prettyprinter.cc b/src/prettyprinter.cc
index e71489fa7f2c401111468f7de94d55bf24075a4a..bf28cc6378749a94217a0949bd04da43a01fc11b 100644
--- a/src/prettyprinter.cc
+++ b/src/prettyprinter.cc
@@ -360,6 +360,11 @@ void CallPrinter::VisitSpread(Spread* node) {
 }
 
 
+void CallPrinter::VisitEmptyParentheses(EmptyParentheses* node) {
+  UNREACHABLE();
+}
+
+
 void CallPrinter::VisitThisFunction(ThisFunction* node) {}
 
 
@@ -845,6 +850,11 @@ void PrettyPrinter::VisitSpread(Spread* node) {
 }
 
 
+void PrettyPrinter::VisitEmptyParentheses(EmptyParentheses* node) {
+  Print("()");
+}
+
+
 void PrettyPrinter::VisitThisFunction(ThisFunction* node) {
   Print("<this-function>");
 }
@@ -1565,6 +1575,11 @@ void AstPrinter::VisitSpread(Spread* node) {
 }
 
 
+void AstPrinter::VisitEmptyParentheses(EmptyParentheses* node) {
+  IndentedScope indent(this, "()");
+}
+
+
 void AstPrinter::VisitThisFunction(ThisFunction* node) {
   IndentedScope indent(this, "THIS-FUNCTION");
 }