add another corner case of here documents, which bash and zsh pass

inspired by:
20:14⎜«twkm:#ksh» $ unset foo ; read -u10 foo 10<<< bar ; echo $foo
which works in ksh93 (whose fd>9-support is still incomplete though)

check.t

@@ -1,4 +1,4 @@
-# $MirOS: src/bin/mksh/check.t,v 1.205 2008/07/08 22:29:00 tg Exp $
+# $MirOS: src/bin/mksh/check.t,v 1.206 2008/07/09 20:31:19 tg Exp $
 # $OpenBSD: bksl-nl.t,v 1.2 2001/01/28 23:04:56 niklas Exp $
 # $OpenBSD: history.t,v 1.5 2001/01/28 23:04:56 niklas Exp $
 # $OpenBSD: read.t,v 1.3 2003/03/10 03:48:16 david Exp $
@@ -1498,6 +1498,14 @@ expected-stdout:
 	one
 		 $sabeq onm
 ---
+name: heredoc-9d
+description:
+	Check another corner case of here strings
+stdin:
+	tr abcdefghijklmnopqrstuvwxyz nopqrstuvwxyzabcdefghijklm <<< bar
+expected-stdout:
+	one
+---
 name: heredoc-quoting-unsubst
 description:
 	Check for correct handling of quoted characters in