https://git.ruby-lang.org/ruby.git/commit/?id=a087e027bf

From a087e027bf7cf0fbb825f1d55668f85ab1f3c9e6 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 5 Nov 2019 01:32:26 +0900
Subject: Fixed conditional expressions with only one void side


diff --git a/parse.y b/parse.y
index 61c1174..5295c63 100644
--- a/parse.y
+++ b/parse.y
@@ -955,7 +955,7 @@ static void token_info_warn(struct parser_params *p, const char *token, token_in https://github.com/ruby/ruby/blob/trunk/parse.y#L955
 
 #define WARN_EOL(tok) \
     (looking_at_eol_p(p) ? \
-     rb_warning0("`" tok "' at the end of line without an expression") : \
+     (void)rb_warning0("`" tok "' at the end of line without an expression") : \
      (void)0)
 static int looking_at_eol_p(struct parser_params *p);
 %}
-- 
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