Scala implicits resolution mechanism is declaration order dependent?

Question

During daily Scala coding I faced an issue that Scala implicits resolution depends on declaration order. A simple example:

object example extends App {
  tra         


        

Answer 1

A possible workaround keeping the order you wished:

object A {
    implicit val aFoo: FooTypeClass[A] = new FooTypeClass[A] {
      def foo: A = new A {
        override def toString = "a"
      }
    }
  }

I keep on seeking for the explanation why object (instead of val) doesn't fit.