service Getter("test"):
    createStr: u32 -> string

service OpO("op"):
    identity: string -> string

-- a question mark means that this constant could be rewritten before this definition
const anotherConst ?= "default-str"
const uniqueConst ?= 5

func callConstant() -> []string, u8:
    res: *string
    res <- Getter.createStr(uniqueConst)
    res <- OpO.identity(anotherConst)
    <- res, 5