Shows errors encountered trying the examples at http://twitter.github.io/scala_school/advanced-types.html

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Welcome to Scala version 2.10.2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_21).
Type in expressions to have them evaluated.
Type :help for more information.

scala> implicit def strToInt(x:String) = x.toInt
warning: there were 1 feature warning(s); re-run with -feature for details
strToInt: (x: String)Int

scala> class C[A](v:A){def a(implicit ev:A=>Int)=123+ev(v)}
defined class C

scala> class D[A](v:A){def a[A<%Int]=123+v}
<console>:8: error: overloaded method value + with alternatives:
  (x: Double)Double <and>
  (x: Float)Float <and>
  (x: Long)Long <and>
  (x: Int)Int <and>
  (x: Char)Int <and>
  (x: Short)Int <and>
  (x: Byte)Int <and>
  (x: String)String
 cannot be applied to (A)
       class D[A](v:A){def a[A<%Int]=123+v}
                                        ^

scala> class E[A](v:A){def a(implicit ev:A<%<Int)=123+v}
<console>:8: error: not found: type <%<
       class E[A](v:A){def a(implicit ev:A<%<Int)=123+v}
                                          ^
<console>:8: error: overloaded method value + with alternatives:
  (x: Double)Double <and>
  (x: Float)Float <and>
  (x: Long)Long <and>
  (x: Int)Int <and>
  (x: Char)Int <and>
  (x: Short)Int <and>
  (x: Byte)Int <and>
  (x: String)String
 cannot be applied to (A)
       class E[A](v:A){def a(implicit ev:A<%<Int)=123+v}