scalac is checking that you have a case for each possible pattern for
the given value, which it can determine because Box and its subclasses
are sealed.
In this case, you explicitly handle Full and Empty, but do not
consider Failure or its subclass ParamFailure, which will cause a
MatchError at runtime if selectedTag is one of those.
Add a case for Failure, or change your case Empty => to case _ => and
the warning will probably go away.
-Ross
On Aug 28, 2009, at 11:51 PM, g-man wrote:
>
> I am getting this warning during compile of my ToDo tutorial app
> enhancement:
>
> ToDo.scala:355: warning: match is not exhaustive!
> missing combination ParamFailure
> missing combination Failure
> case Nil => selectedTag match {
>
> My code is:
>
> currentTask.validate match {
> case Nil => selectedTag match {
> case Full(currentTag) => if (! currentTask.saved_?) {
> currentTask.save
> JoinTags.joinTask(currentTag, currentTask)
> S.notice("added Task: " + currentTask.desc.is)
> }
> case Empty => S.error("..please supply a Tag");
> S.mapSnippet("ToDo.addTask", doTaskBind)
> }
> case xs => S.error(xs); S.mapSnippet("ToDo.addTask",
> doTaskBind)
> }
>
> The code runs fine so far... Is it the nested match?
> >
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