https://git.ruby-lang.org/ruby.git/commit/?id=b091889ed6

From b091889ed67f278b1652ddde88596e2160d5aef0 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 26 Jan 2021 10:31:53 +0900
Subject: Removed YYUSE [Bug #17582]

Although it was used just to suppress an "unsed argument" warning
in the same manner as other bison-provided functions, it has been
dropped since Bision 3.7.5.  And we always suppress that
warnings.
---
 parse.y | 1 -
 1 file changed, 1 deletion(-)

diff --git a/parse.y b/parse.y
index ddaa9f6..41e9894 100644
--- a/parse.y
+++ b/parse.y
@@ -13334,7 +13334,6 @@ count_char(const char *str, int c) https://github.com/ruby/ruby/blob/trunk/parse.y#L13334
 RUBY_FUNC_EXPORTED size_t
 rb_yytnamerr(struct parser_params *p, char *yyres, const char *yystr)
 {
-    YYUSE(p);
     if (*yystr == '"') {
 	size_t yyn = 0, bquote = 0;
 	const char *yyp = yystr;
-- 
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