Some code in "An Introduction to Scala" does not compile
with current Scala compilers (e.g. 2.3.1).


p7 (javac) illegal start of expression
public String mail() default = "";
should be
public String mail() default "";


p12 Automatic User-Defined Coercions

// error: method coerce is defined twice
def coerce: Float = numerator.asInstanceOf[Float] / denominator
def coerce: Double = numerator.asInstanceOf[Double] / denominator

// error: type mismatch;
//  found   : examples.Frac
//  required: scala.Double
Console.println(Math.sqrt(Frac(1,2)) + ", " +

This came up in the newsgroup:-
http://article.gmane.org/gmane.comp.lang.scala/3238
http://article.gmane.org/gmane.comp.lang.scala/3239
http://article.gmane.org/gmane.comp.lang.scala/3240

I suspect that views made coerce obsolete and that the example should use views and thus appear later in the document. Is this correct?


p35 Obsolete use of with without extends:
object GraphTest with Application {
should be
object GraphTest extends Application {


p37 private class LoopUnlessCond escapes its defining scope
private class LoopUnlessCond(body: => Unit) {
should be
class LoopUnlessCond(body: => Unit) {
(Alternately, the return type of loop should be a public class or trait that LoopUnlessCond extends.)


p41 prefix method name with `&'
set += main // add the main function
should be
set += &main // add the main function