so-25069914.swift

protocol protokol {}
class klass : protokol {}
let array : [protokol] = [klass()] as [klass] // EXC_BAD_ACCESS

//////////////////////////////////////////////////

class klass {}
var global : [Any] = []
let block : () -> () = {
    global = [klass()] as [klass]
    for element in global {} // EXC_BAD_ACCESS
}; block()

//////////////////////////////////////////////////

protocol protokol {}
class klass : protokol {}
var outer = [protokol]()
var inner = [klass()]
outer = inner // EXC_BAD_ACCESS

//////////////////////////////////////////////////

class klass {}
var outer = [Any]()
var inner = [klass()]
outer = inner // EXC_BAD_ACCESS

//////////////////////////////////////////////////

protocol protokol {}
class klass : protokol {}
var outer = [protokol]()
var inner : [protokol] = [klass()] // WORKS
outer = inner