From 6fdcd6117120fa6ec0499ed40ebf6e83d45f2389 Mon Sep 17 00:00:00 2001
From: Timothy Clem <timothy.clem@gmail.com>
Date: Wed, 2 Aug 2017 08:07:15 -0700
Subject: [PATCH] Handle empty hash pair in Ruby. e.g. `{() => ()}`

---
 src/Language/Ruby/Syntax.hs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Language/Ruby/Syntax.hs b/src/Language/Ruby/Syntax.hs
index f4ba78437..fe0842382 100644
--- a/src/Language/Ruby/Syntax.hs
+++ b/src/Language/Ruby/Syntax.hs
@@ -290,6 +290,7 @@ subscript = makeTerm <$> symbol ElementReference <*> children (Expression.Subscr
 
 pair :: Assignment
 pair = makeTerm <$> symbol Pair <*> children (Literal.KeyValue <$> expression <*> expression)
+   <|> makeTerm <$> symbol Pair <*> (Syntax.Empty <$ source)
 
 methodCall :: Assignment
 methodCall = makeTerm <$> symbol MethodCall <*> children (Expression.Call <$> expression <*> args <*> (block <|> emptyTerm))