usa	2017-12-01 14:32:29 +0900 (Fri, 01 Dec 2017)

  New Revision: 60957

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=60957

  Log:
    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()`.

  Modified files:
    trunk/io.c
Index: io.c
===================================================================
--- io.c	(revision 60956)
+++ io.c	(revision 60957)
@@ -7767,6 +7767,11 @@ void https://github.com/ruby/ruby/blob/trunk/io.c#L7767
 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;

--
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