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Errata for Programming in Scala
Chapter 4: Classes and Objects
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Page 71 (PDF page 109): 
The Application trait used in Listing 4.4 has been deprecated in 2.9.0
and is no longer available in 2.11.6 (can't find the exact release it was
removed in). 

object FallWinterSpringSummer extends Application {

should now be

object FallWinterSpringSummer extends App {

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