ah, so this is how it fails, in a function!

check.t

@@ -1,4 +1,4 @@
-# $MirOS: src/bin/mksh/check.t,v 1.245 2008/11/30 16:53:15 tg Exp $
+# $MirOS: src/bin/mksh/check.t,v 1.246 2008/11/30 16:57:40 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 $
@@ -5254,9 +5254,12 @@ stdin:
 		echo dwa >&2
 		echo tri >&3
 	}
-	[[ -e bar ]] && threeout &>foo
+	function blubb {
+		[[ -e bar ]] && threeout "$bf" &>foo
+	}
+	blubb
 	echo -n >bar
-	[[ -e bar ]] && threeout &>foo
+	blubb
 	echo ===
 	cat foo
 expected-stdout: