Github user michalsenkyr commented on the issue:
https://github.com/apache/spark/pull/16240
None of them. The compilation will fail. That is why I had to provide those
additional implicits.
```
scala> class Test[T]
defined class Test
scala> implicit def test1[T <: Seq[String]]: Test[T] = null
test1: [T <: Seq[String]]=> Test[T]
scala> implicit def test2[T <: Product]: Test[T] = null
test2: [T <: Product]=> Test[T]
scala> def test[T : Test](t: T) = null
test: [T](t: T)(implicit evidence$1: Test[T])Null
scala> test(List("abc"))
<console>:31: error: ambiguous implicit values:
both method test1 of type [T <: Seq[String]]=> Test[T]
and method test2 of type [T <: Product]=> Test[T]
match expected type Test[List[String]]
test(List("abc"))
```
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