StringPlusAny triggers when interpolating strings

[Philippus]

the following test passes on scala 2.12.8, but fails on scala 2.13.0-RC1

  test("string interpolation is allowed") {
    val b: Boolean = true
    val result = WartTestTraverser(StringPlusAny) {
      s"$b"
    }
    assertEmpty(result)
  }

[xuwei-k]

related (or duplicate?) issues

• Prohibiting automatic .toString in string interpolation (like s"$someclass"). #394
• Wart for implicit toString in String concatenation and interpoltion #93

[ClaireNeveu]

It might make sense to just fold StringPlusAny into ToString to get a wart which consistently forbids s. I made them two different warts for historical reasons but I haven't seen a lot of people who want one but not the other.