ash: handle "A=1 A=2 B=$A; echo $B". closes bug 947.

shell/ash_test/ash-vars/var1.right

@@ -0,0 +1,6 @@
+a=a A=a
+a=a A=a
+a= A=
+a= A=
+a=a A=a
+a=a A=a

shell/ash_test/ash-vars/var1.tests

@@ -0,0 +1,14 @@
+# check that first assignment has proper effect on second one
+
+(
+a=a A=$a
+echo a=$a A=$A
+)
+(a=a A=$a; echo a=$a A=$A)
+(a=a A=$a echo a=$a A=$A)
+(a=a A=$a /bin/echo a=$a A=$A)
+
+f() { echo a=$a A=$A; }
+
+(a=a A=$a f)
+(a=a A=$a; f)

shell/ash_test/ash-vars/var2.right

@@ -0,0 +1 @@
+bus/usb/1/2

shell/ash_test/ash-vars/var2.tests

@@ -0,0 +1 @@
+X=usbdev1.2 X=${X#usbdev} B=${X%%.*} D=${X#*.}; echo bus/usb/$B/$D