t2316.scala:28: error: ambiguous implicit values:
 both method T1FromT3 in object T1 of type (implicit t3: test.T3)test.T1
 and method T1FromT2 in object T1 of type (implicit t2: test.T2)test.T1
 match expected type test.T1
      val t1 = requireT1
               ^
one error found