+###### test: func_ret_type
+
+ func double(n:number):number
+ use n+n
+
+ func answer
+ prefix:string
+ suffix:string
+ return string
+ do
+ use prefix ++ suffix
+
+ func noarg_returns
+ return Boolean
+ do
+ use 22/7 == 3.14159
+
+ func main()
+ for j:=10; then j = j - 3; while j > -5:
+ print answer("dou","ble"), j, "is", double(j)
+
+###### output: func_ret_type
+ double 10 is 20
+ double 7 is 14
+ double 4 is 8
+ double 1 is 2
+ double -2 is -4
+