When I compile the following code:

import oak.io.*;

class foo {
    static void broken()
    {
InputStream f = null;
try {
f = new FileInputStream("/tmp/junk");
} finally {
if (f != null)
f.close();
}
    }
}

I get the following:

pan:/tmp[1028] oakc foo.oak
oak.tools.oak.InternalError selectType: convert
at oak.lang.Exception.<init>(Exception.oak)
at oak.tools.oak.InternalError.<init>(InternalError.oak)
at oak.tools.tree.UnaryExpression.selectType(UnaryExpression.oak)
at oak.tools.tree.UnaryExpression.checkValue(UnaryExpression.oak)
at oak.tools.tree.BinaryExpression.checkValue(BinaryExpression.oak)
at oak.tools.tree.Expression.checkCondition(Expression.oak)
at oak.tools.tree.Expression.checkCondition(Expression.oak)
at oak.tools.tree.IfStatement.check(IfStatement.oak)
at oak.tools.tree.CompoundStatement.check(CompoundStatement.oak)
at oak.tools.tree.FinallyStatement.check(FinallyStatement.oak)
oakc: an exception has occurred, please contact x47242.