https://git.ruby-lang.org/ruby.git/commit/?id=93aaa0bcce

From 93aaa0bcce829b880d8f52a9168d17c93ecde85b Mon Sep 17 00:00:00 2001
From: Kazuki Tsujimoto <kazuki@c...>
Date: Sun, 1 Mar 2020 14:23:51 +0900
Subject: Allow trailing comma in hash pattern

(cherry picked from commit d25a4f413dce6ad3a8baaf61591415b9a8cce082)

diff --git a/parse.y b/parse.y
index c767637..b1a7e08 100644
--- a/parse.y
+++ b/parse.y
@@ -4053,6 +4053,10 @@ p_kwargs	: p_kwarg ',' p_kwrest https://github.com/ruby/ruby/blob/trunk/parse.y#L4053
 		    {
 			$$ =  new_hash_pattern_tail(p, new_unique_key_hash(p, $1, &@$), 0, &@$);
 		    }
+		| p_kwarg ','
+		    {
+			$$ =  new_hash_pattern_tail(p, new_unique_key_hash(p, $1, &@$), 0, &@$);
+		    }
 		| p_kwrest
 		    {
 			$$ =  new_hash_pattern_tail(p, new_hash(p, Qnone, &@$), $1, &@$);
diff --git a/test/ruby/test_pattern_matching.rb b/test/ruby/test_pattern_matching.rb
index 6dbb25c..a3b7dcf 100644
--- a/test/ruby/test_pattern_matching.rb
+++ b/test/ruby/test_pattern_matching.rb
@@ -1042,6 +1042,15 @@ END https://github.com/ruby/ruby/blob/trunk/test/ruby/test_pattern_matching.rb#L1042
       end
     end
 
+    assert_block do
+      case {a: 0, b: 1}
+      in {a: 1,}
+        false
+      in {a:,}
+        true
+      end
+    end
+
     assert_syntax_error(%q{
       case _
       in "a-b":
-- 
cgit v0.10.2


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