From db0e0dad1171456253ebd899e7e878823923d3d8 Mon Sep 17 00:00:00 2001
From: Kazuki Tsujimoto <kazuki@callcc.net>
Date: Fri, 9 Sep 2022 14:00:27 +0900
Subject: [PATCH] Fix unexpected "duplicated key name" error in paren-less one
 line pattern matching

[Bug #18990]
---
 parse.y                            | 16 ++++++++++++----
 test/ruby/test_pattern_matching.rb | 12 ++++++++++++
 2 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/parse.y b/parse.y
index e6fee29595..38f7690ccc 100644
--- a/parse.y
+++ b/parse.y
@@ -1774,14 +1774,18 @@ expr		: command_call
 			p->ctxt.in_kwarg = 1;
 			$<tbl>$ = push_pvtbl(p);
 		    }
+		    {
+			$<tbl>$ = push_pktbl(p);
+		    }
 		  p_top_expr_body
 		    {
+			pop_pktbl(p, $<tbl>4);
 			pop_pvtbl(p, $<tbl>3);
 			p->ctxt.in_kwarg = $<ctxt>2.in_kwarg;
 		    /*%%%*/
-			$$ = NEW_CASE3($1, NEW_IN($4, 0, 0, &@4), &@$);
+			$$ = NEW_CASE3($1, NEW_IN($5, 0, 0, &@5), &@$);
 		    /*% %*/
-		    /*% ripper: case!($1, in!($4, Qnil, Qnil)) %*/
+		    /*% ripper: case!($1, in!($5, Qnil, Qnil)) %*/
 		    }
 		| arg keyword_in
 		    {
@@ -1792,14 +1796,18 @@ expr		: command_call
 			p->ctxt.in_kwarg = 1;
 			$<tbl>$ = push_pvtbl(p);
 		    }
+		    {
+			$<tbl>$ = push_pktbl(p);
+		    }
 		  p_top_expr_body
 		    {
+			pop_pktbl(p, $<tbl>4);
 			pop_pvtbl(p, $<tbl>3);
 			p->ctxt.in_kwarg = $<ctxt>2.in_kwarg;
 		    /*%%%*/
-			$$ = NEW_CASE3($1, NEW_IN($4, NEW_TRUE(&@4), NEW_FALSE(&@4), &@4), &@$);
+			$$ = NEW_CASE3($1, NEW_IN($5, NEW_TRUE(&@5), NEW_FALSE(&@5), &@5), &@$);
 		    /*% %*/
-		    /*% ripper: case!($1, in!($4, Qnil, Qnil)) %*/
+		    /*% ripper: case!($1, in!($5, Qnil, Qnil)) %*/
 		    }
 		| arg %prec tLBRACE_ARG
 		;
diff --git a/test/ruby/test_pattern_matching.rb b/test/ruby/test_pattern_matching.rb
index 36731e14f9..fbb934dc84 100644
--- a/test/ruby/test_pattern_matching.rb
+++ b/test/ruby/test_pattern_matching.rb
@@ -1570,6 +1570,18 @@ END
     assert_equal false, (1 in 2)
   end
 
+  def test_bug18990
+    {a: 0} => a:
+    assert_equal 0, a
+    {a: 0} => a:
+    assert_equal 0, a
+
+    {a: 0} in a:
+    assert_equal 0, a
+    {a: 0} in a:
+    assert_equal 0, a
+  end
+
   ################################################################
 
   def test_single_pattern_error_value_pattern