From c88c7d911f215ef581d0292e93bc38a11e9b7cd1 Mon Sep 17 00:00:00 2001
From: usa <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 1 Dec 2017 05:32:29 +0000
Subject: [PATCH] bold/underscore support in traceback before Windows10

* io.c (rb_write_error2): call `rb_w32_write_console()` when the device is tty,
  like `rb_write_error_str()`.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60957 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 io.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/io.c b/io.c
index ac2f246b51..e3d93059f1 100644
--- a/io.c
+++ b/io.c
@@ -7767,6 +7767,11 @@ void
 rb_write_error2(const char *mesg, long len)
 {
     if (rb_stderr == orig_stderr || RFILE(orig_stderr)->fptr->fd < 0) {
+#ifdef _WIN32
+	if (isatty(fileno(stderr))) {
+	    if (rb_w32_write_console(rb_str_new(mesg, len), fileno(stderr)) > 0) return;
+	}
+#endif
 	if (fwrite(mesg, sizeof(char), (size_t)len, stderr) < (size_t)len) {
 	    /* failed to write to stderr, what can we do? */
 	    return;