When I compile the following code:

import oak.io.*;

class foo {
    static final int CAT = 1;
    static final int DOG = 2;

    boolean broken(int i) {
        switch (i) {
           case CAT: return true;
           case DAWG: return true;
           default: return false;
        }
    }
}
I get the following error:

pan:/tmp[1031] oakc foo.oak
oak.lang.NullPointerException
at oak.tools.tree.IdentifierExpression.inlineValue(IdentifierExpression.oak)
at oak.tools.tree.CaseStatement.check(CaseStatement.oak)
at oak.tools.tree.SwitchStatement.check(SwitchStatement.oak)
at oak.tools.tree.CompoundStatement.check(CompoundStatement.oak)
at oak.tools.tree.Statement.checkMethod(Statement.oak)
at oak.tools.oakc.SourceField.check(SourceField.oak)
at oak.tools.oakc.SourceClass.check(SourceClass.oak)
at oak.tools.oakc.SourceClass.compile(SourceClass.oak)
at oak.tools.oakc.Main.main(Main.oak)
oakc: an exception has occurred, please contact x47242.
foo.oak:10: Undefined variable: DAWG
foo.oak:10: case DAWG: return true;
            ^