Swift compiler segmentation fault when building

Question

Adding a (convenient) computed height property to UIView in my UIViewExtension.swift file is causing the Swift compiler to segfault...

Answer 1

I got this error while extending one of my protocols and mistyped and optional type argument.

protocol SomeProtocolName: class {
    var someProtocolVariable: String { get set }

    func someProtocolFunction(someProtocolVariable: String)
}

// MARK:
extension SomeProtocolName {
    func someProtocolFunction(someProtocolVariable: String?) {
        self.someProtocolVariable = someProtocolVariable
    }
}

The difference in function arguments String in prototype and String? in extension caused Segmentation Fault 11.