Swiftc crashes with seg fault 11 on compiling implementation of self constrained generic protocols.

Originator:Nikita.Leonov
Number:rdar://23345347 Date Originated:October 31, 2015
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode 7.1
Classification:Crash/Hang/Data Loss Reproducible:Always
 
Summary:
Following code is a miserable try to implement self-constrained generics for protocols, it crashes swiftc:

struct Container<T> {
}

protocol ContainerProtocol {
    typealias ValueType
}

extension Container: ContainerProtocol {
    typealias ValueType = T
}

class App<T: ContainerProtocol where T.ValueType == T> {
    var container: T
    
    init(_ container: T) {
        self.container = container
    }
}

App(Container())

Steps to Reproduce:
swiftc ./self-constrained-generic-protocol.swift

Expected Results:
it will compile

Actual Results:
it will crash with set fault 11

Comments


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