gistfile1.txt

Welcome to Scala 2.12.0-M5 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_45).
Type in expressions for evaluation. Or try :help.

scala> case class Foo(x: Int)
defined class Foo

scala> object Bar {
     |   implicit val foo: Foo = Foo(1)
     |   object Baz {
     |     implicit val foo: Foo = Foo(2)
     |     println(implicitly[Foo])
     |   }
     | }
defined object Bar

scala> Bar.Baz
Foo(2)
res0: Bar.Baz.type = Bar$Baz$@7ff35a3f

scala> object Bar {
     |   implicit val foo: Foo = Foo(1)
     |   object Baz {
     |     implicit val foo2: Foo = Foo(2)
     |     println(implicitly[Foo])
     |   }
     | }
<console>:17: error: ambiguous implicit values:
 both value foo in object Bar of type => Foo
 and value foo2 in object Baz of type => Foo
 match expected type Foo
           println(implicitly[Foo])
                             ^

scala> :quit