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stephenjudkins/gist:4230122

Created December 7, 2012 01:59
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gistfile1.scala
scala> @annotation.implicitNotFound("whoa there! ${A} is not ${B}, buddy") trait Equals[A,B]
defined trait Equals
scala> implicit def equals[A,B](implicit e: A =:= B):Equals[A,B] = null
equals: [A, B](implicit e: =:=[A,B])Equals[A,B]
scala> implicitly[Equals[String, Int]]
<console>:16: error: whoa there! String is not Int, buddy
implicitly[Equals[String, Int]]
^
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