func test5(a:number):string
print a
+ struct foo
+ a: number
+ b:string = "hello"
+
+ func test6(a:number):foo
+ b:foo
+ b.a = a
+ use b
+
###### output: func_err_args
+ .tmp.code:34:5: error: function cannot return value of type foo
.tmp.code:28:14: error: expected string, found none
.tmp.code:25:8: error: expected string, found number
.tmp.code:15:14: error: insufficient arguments to function.