From c60dbcd1c55cd77a24c41d5e1a9555622be8b2b8 Mon Sep 17 00:00:00 2001
From: Shugo Maeda <shugo@ruby-lang.org>
Date: Sat, 11 Sep 2021 18:49:12 +0900
Subject: Allow value omission in Hash literals

`{x:, y:}` is a syntax sugar of `{x: x, y: y}`.
---
 parse.y | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'parse.y')

diff --git a/parse.y b/parse.y
index 8017011bb7..d4443d50d2 100644
--- a/parse.y
+++ b/parse.y
@@ -5617,6 +5617,15 @@ assoc		: arg_value tASSOC arg_value
 		    /*% %*/
 		    /*% ripper: assoc_new!($1, $2) %*/
 		    }
+		| tLABEL
+		    {
+		    /*%%%*/
+			NODE *val = gettable(p, $1, &@$);
+			if (!val) val = NEW_BEGIN(0, &@$);
+			$$ = list_append(p, NEW_LIST(NEW_LIT(ID2SYM($1), &@1), &@$), val);
+		    /*% %*/
+		    /*% ripper: assoc_new!($1, id_is_var(p, get_id($1)) ? var_ref!($1) : vcall!($1)) %*/
+		    }
 		| tSTRING_BEG string_contents tLABEL_END arg_value
 		    {
 		    /*%%%*/
-- 
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