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[SR-9224] Illegal instruction: 4 when there's an inheritance cycle involving protocols and existentials #51713

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regexident opened this issue Nov 12, 2018 · 2 comments
Open

[SR-9224] Illegal instruction: 4 when there's an inheritance cycle involving protocols and existentials #51713

regexident opened this issue Nov 12, 2018 · 2 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself crash Bug: A crash, i.e., an abnormal termination of software

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@regexident
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Previous ID SR-9224
Radar None
Original Reporter @regexident
Type Bug
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, CompilerCrash
Assignee None
Priority Medium

md5: 005de01e47ddb3735e89e4fd26f3b928

Issue Description:

Compiling this:

protocol Foo: Foobar {}

protocol Bar: Foobar {}

typealias Foobar = Foo & Bar

Leads to this:

error: unable to execute command: Illegal instruction: 4
error: compile command failed due to signal 4 (use -v to see invocation)

Not expecting this to work to begin with, but a human-friendly error message would be nice here.
@belkadan
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Looks like it's fixed in master. I'll add a test case for it.

@belkadan
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Finally got around to this: #23919 The diagnostics aren't great, so I'll leave the bug open, but at least we can be sure the compiler won't start crashing again.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@AnthonyLatsis AnthonyLatsis added the crash Bug: A crash, i.e., an abnormal termination of software label Dec 12, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself crash Bug: A crash, i.e., an abnormal termination of software
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@regexident @belkadan @AnthonyLatsis