typeerror.check

来自「JAVA 语言的函数式编程扩展」· CHECK 代码 · 共 7 行

typeerror.scala:6: error: type mismatch;
 found   : Long(in method add)
 required: Long(in package scala)
    else add2(x.head, y.head) :: add(x.tail, y.tail)
                ^
one error found