bug414.check

来自「JAVA 语言的函数式编程扩展」· CHECK 代码 · 共 12 行

bug414.scala:5: error: pattern type is incompatible with expected type;
 found   : object Empty
 required: IntMap[a]
                case Empty =>
                     ^
bug414.scala:7: error: type mismatch;
 found   : Unit
 required: a
                case _ =>
                       ^
two errors found