make another Debian posh bug into a regression test (expected-fail)

check.t

@@ -1,4 +1,4 @@
-# $MirOS: src/bin/mksh/check.t,v 1.313 2009/10/02 16:59:53 tg Exp $
+# $MirOS: src/bin/mksh/check.t,v 1.314 2009/10/02 17:05:01 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 $
@@ -220,6 +220,18 @@ expected-stdout:
 	30
 	1,j+=2
 ---
+name: arith-lazy-3
+description:
+	Check that assignments not done on non-evaluated side of ternary
+	operator and this construct is parsed correctly (Debian #445651)
+expected-fail: yes
+stdin:
+	x=4
+	y=$((0 ? x=1 : 2))
+	echo = $x $y =
+expected-stdout:
+	= 4 2 =
+---
 name: arith-ternary-prec-1
 description:
 	Check precedence of ternary operator vs assignment