https://git.ruby-lang.org/ruby.git/commit/?id=56e002981f

From 56e002981fab73a94c6038cb9de82aba6ff84eb4 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 25 Dec 2019 14:47:31 +0900
Subject: Show the error line only when same as the current


diff --git a/parse.y b/parse.y
index 6d9bfc9..1281eb6 100644
--- a/parse.y
+++ b/parse.y
@@ -5631,7 +5631,18 @@ static void ruby_show_error_line(VALUE errbuf, const YYLTYPE *yylloc, int lineno https://github.com/ruby/ruby/blob/trunk/parse.y#L5631
 static inline void
 parser_show_error_line(struct parser_params *p, const YYLTYPE *yylloc)
 {
-    ruby_show_error_line(p->error_buffer, yylloc, p->ruby_sourceline, p->lex.lastline);
+    VALUE str;
+    int lineno = p->ruby_sourceline;
+    if (!yylloc) {
+	return;
+    }
+    else if (yylloc->beg_pos.lineno == lineno) {
+	str = p->lex.lastline;
+    }
+    else {
+	return;
+    }
+    ruby_show_error_line(p->error_buffer, yylloc, lineno, str);
 }
 
 static int
-- 
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