This line

let (x: Int, y: Double) = (3, 1)

doesn't do what you think: it's saying "convert (3, 1) to (x: 3, y: 1), then unpack that into two variables named 'Int' and 'Double'". We have other bugs about warning when that happens, but whether or not it's desired behavior it shouldn't result in a crash.

@swift-ci create

Comment by Fred Riss (JIRA)

About the crash: It looks like you're using the Playground in "Automatically run" mode. Can you confirm whether the crash happens when using "Manually Run" mode too? You can change this with a long press on the run triangle at the bottom of the playground

Comment by Nhat Le Tien (JIRA)

friss (JIRA User): Cannot reproduce crash with `Manually Run` mode. I just get the result like the picture bellow:

nhatlee89 (JIRA User) as Jordan explained the compiler behavior is correct. However you've found an lldb bug. I can reproduce a crash here but it has a different backtrace than what you were seeing:

Thread 7 Crashed:: <lldb.process.internal-state(pid=40368)>
0   com.apple.LLDB.framework        0x0000000110e08f9d lldb_private::ThreadList::WillResume() + 181
1   com.apple.LLDB.framework        0x0000000110dc08aa lldb_private::Process::PrivateResume() + 252
2   com.apple.LLDB.framework        0x0000000110dc6e13 lldb_private::Process::ShouldBroadcastEvent(lldb_private::Event*) + 849
3   com.apple.LLDB.framework        0x0000000110dc3795 lldb_private::Process::HandlePrivateEvent(std::__1::shared_ptr<lldb_private::Event>&) + 203
4   com.apple.LLDB.framework        0x0000000110dc765e lldb_private::Process::RunPrivateStateThread(bool) + 858
5   com.apple.LLDB.framework        0x0000000110dc6ea6 lldb_private::Process::PrivateStateThread(void*) + 22
6   com.apple.LLDB.framework        0x0000000110d9a3ef lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(void*) + 105
7   libsystem_pthread.dylib         0x00007fff77759305 _pthread_body + 126
8   libsystem_pthread.dylib         0x00007fff7775c26f _pthread_start + 70
9   libsystem_pthread.dylib         0x00007fff77758415 thread_start + 13

Can you double-check that you attached the right crash logs?

Comment by Fred Riss (JIRA)

Slava, this is a known issue, and the reason why I asked if it happens in Manual mode. Do you get this while running the Playground in Manual mode?

No, I am not able to reproduce it in Manual mode.

Comment by Nhat Le Tien (JIRA)

@slavapestov: I had tried to attached the crash logs in the date I got this crash, so I think those must content the right log for this crash. But don't know if those had the same root cause, because I also used Xcode projects in that date too, not just playground.