Correct generic signature for intersection involving Array

[smarter]

We can't just check the class symbol since both Array[Int] and
Array[String] have the same symbol but different erasure.

Fixes #12204.

[michelou]

We can't just check the class symbol since both Array[Int] and
Array[String] have the same symbol but different erasure.

Fixes #12204.

@smarter Possible candidate for a RC4 or the timeline would be too short to get the 3.0.0-final out for Scalacon 2021 ?!

[smarter]

This is just about calls from Java and only an issue for a type whose only value is null, so not critical at all and not worth backporting.

[bishabosha]

While the fix works for the given example, there is also a mismatch when the array parameters are for value classes:

class A
class B

class VC1(val toStr: A) extends AnyVal
class VC2(val toInt: B) extends AnyVal

class Z {
  def ARRAY_132(x: Array[VC1] with Array[VC2]): Unit = {}
}

this produces a generic signature (x: A[]): void and descriptor (x: VC1[]): void

[smarter]

Isn't that a special case of the separate issue #12189 ?

[bishabosha]

Isn't that a special case of the separate issue #12189 ?

oh yeah you're right 😂