Simple arrays swap fails, when inlined

[edolgy]

given (x: Array[Char]) extended with {
  inline def swap(i: Int, j: Int) : Unit =
    val v = x(i)
    x(i)  = x(j)
    x(j)  = v
}

val a = Array('A','B')

a.swap(0,1)

println(a.toList)

// Run Result
List(B, B)

// Expectation
List(B, A)

If "inline" is removed, the expectation is fulfilled