scala: Cannot check match for unreachability

Question

I'm migrating an app from play 2.0.4 to play 2.1 But the following code raises this warning: ``` def toConditionOperator(value: String): ConditionOperator.Value = { if (value==null) { ConditionOperator.Unknown } else { value.toLowerCase match { case "equal" | "=" | ":" => ConditionOperator.Equal case "notequal" | "!=" | "!:" | "<>" => ConditionOperator.NotEqual case "greaterorequal" | ">=" => ConditionOperator.GreaterOrEqual case "greater" | ">" => ConditionOperator.Greater case "lessorequal" | "<=" => ConditionOperator.LessOrEqual case "less" | "<" => ConditionOperator.Less case "between" => ConditionOperator.Between case "in" => ConditionOperator.In case "startswith" => ConditionOperator.StartsWith case "endswith" => ConditionOperator.EndsWith case "contains" | "$" => ConditionOperator.Contains case "missing" | "" => ConditionOperator.Missing case "unknown" | _ => ConditionOperator.Unknown } } } [info] Compiling 98 Scala sources and 2 Java sources to /home/sas/tmp/ideas-ba/webservic…

Accepted Answer

Maybe this?

What happens if you add

```
scalacOptions ++= Seq("-Dscalac.patmat.analysisBudget=1024")
```

to your `project/Build.scala`?

[UPDATE / CORRECTION]

I was wrong about `scalacOptions` - `-D` options need to be passed as JVM arguments, not arguments to `scalac`. Since `sbt`/`play` respect the `JAVA_OPTS` environment, variable, maybe you could try running `play` or `sbt` like this?

```
JAVA_OPTS="-Dscalac.patmat.analysisBudget=off" sbt
# Or
JAVA_OPTS="-Dscalac.patmat.analysisBudget=off" play
```

That's assuming you are on a Unix-y OS.

scala: Cannot check match for unreachability

Solution

Problem