From c8010fcec016ee89aa0c45fe31094b2db0023e5c Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Mon, 28 Dec 2020 01:38:17 +0900
Subject: Dup kwrest hash when merging other keyword arguments [Bug #17481]

---
 compile.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'compile.c')

diff --git a/compile.c b/compile.c
index 264c310012..370a1f4522 100644
--- a/compile.c
+++ b/compile.c
@@ -8157,6 +8157,10 @@ iseq_compile_each0(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, in
 		if (local_body->param.flags.has_kwrest) {
 		    int idx = local_body->local_table_size - local_kwd->rest_start;
 		    ADD_GETLOCAL(args, line, idx, lvar_level);
+                    if (local_kwd->num > 0) {
+                        ADD_SEND(args, line, rb_intern("dup"), INT2FIX(0));
+                        flag |= VM_CALL_KW_SPLAT_MUT;
+                    }
 		}
 		else {
 		    ADD_INSN1(args, line, newhash, INT2FIX(0));
-- 
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