https://git.ruby-lang.org/ruby.git/commit/?id=ca58e83400

From ca58e834007199929e41fca97f3c103dfbab4bb1 Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Wed, 25 Sep 2019 09:48:02 +0900
Subject: Do not use of non-standard escape character '\e'


diff --git a/ext/io/console/console.c b/ext/io/console/console.c
index 2604715..59a14d8 100644
--- a/ext/io/console/console.c
+++ b/ext/io/console/console.c
@@ -1106,7 +1106,7 @@ console_vt_response(int argc, VALUE *argv, VALUE io) https://github.com/ruby/ruby/blob/trunk/ext/io/console/console.c#L1106
 static VALUE
 console_cursor_pos(VALUE io)
 {
-    VALUE query = rb_str_new_cstr("\e[6n");
+    VALUE query = rb_str_new_cstr("\033[6n");
     VALUE resp = console_vt_response(1, &query, io);
     VALUE row, column, term;
     unsigned int r, c;
-- 
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