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object Test {
class A
class B
class C
class F[X]
def f(implicit aa: F[A]) = println(aa)
implicit def a : F[A] = new F[A]()
implicit def b[X <: B]: Test.F[X] = new F[X]()
f
}
/* bug:
error: ambiguous implicit values:
both method b in object Test1 of type [X <: Test1.B]Test1.F[X]
and method a in object Test1 of type => Test1.F[Test1.A]
match expected type Test1.F[Test1.A]
*/
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