service GetStr("multiret-test"):
    retStr(s: *string, a: *string)


func foo_wrapper():
    GetStr.retStr(nil, nil)

func invalid_append() -> *string:
    stream: *string
    cream: *string
    dream: *string
    str: *string
    asdasd: *string
    GetStr.retStr(stream, nil)
    <- stream