[SR-3072] Compiler crashes for protocol extensions implementing another @objc protocol #45662

regexident · 2016-10-28T19:31:24Z

Attachment: Download

Environment

macOS Sierra / iOS 10

Additional Detail from JIRA

md5: abd99d65a1d5e684f38dbf592b60b444

Issue Description:

Making an extension inherit (and implement) another protocol marked as "@objc" crashes during SIL generation:

import Foundation
@objc protocol Foo { func foo() }
protocol Bar: Foo { }
extension Bar { func foo() { } }

Adding "where Self: NSObject" prevents the crash, seems unreasonably restricting though:

import Foundation
@objc protocol Foo { func foo() }
protocol Bar: Foo { }
extension Bar where Self: NSObject { func foo() { } }

Error:

While emitting IR SIL function @_TToFE4mainPS_3Bar3foofT_T_ for 'foo' at Untitled 3.swift:4:17

(See attachment for complete compiler error output.)

regexident · 2017-07-26T09:02:41Z

Compiles successfully since at least:

Apple Swift version 4.0 (swiftlang-900.0.54.11 clang-900.0.31)
Target: x86_64-apple-macosx10.9

swift-ci transferred this issue from apple/swift-issues Apr 25, 2022

AnthonyLatsis added the crash Bug: A crash, i.e., an abnormal termination of software label Dec 12, 2022

This issue was closed.

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