Compiler segmentation fault in Xcode 8 GM using ExpressibleByArrayLiteral

stack.swift

// Save this to stack.swift, then run
//
//     $ xcrun swift stack.swift
//
// Does it compile or does the compiler segfault?

struct Stack<Element> {
    var elements: [Element] = []
}

extension Stack: ExpressibleByArrayLiteral {
    init(arrayLiteral elements: Element...) {
        self.elements = elements
    }
}

If you need a workaround for the time being, this seems to compile fine:

struct Stack<Element> {
    var elements: [Element]
    init(elements: [Element]) {
        self.elements = elements
    }
}

extension Stack: ExpressibleByArrayLiteral {
    init(arrayLiteral elements: Element...) {
        self.elements = elements
    }
}

The problem seems to be related to the inline instantiation of the elements array.

@chrisfsampaio Ah, that's interesting, thanks. Another workaround is to explicitly call self.init from the extension:

struct Stack<Element> {
    var elements: [Element] = []
}

extension Stack: ExpressibleByArrayLiteral {
    init(arrayLiteral elements: Element...) {
        self.init(elements: elements)
    }
}