Compiler crash in Swift 5.7

[Frizlab]

Describe the bug
Trying to compile this repo at this tag crashes the compiler w/ the current preview of Swift 5.7 (see versions later).

When switching to tag __SWIFT_5.7_CRASHER_WORKAROUND__ there are no crashes of the compiler anymore.

To Reproduce
Steps to reproduce the behavior:

1. Clone the repo https://github.com/happn-app/officectl.git and checkout the tag __SWIFT_5.7_CRASHER__
2. Try and compile w/ Swift 5.7 (either on macOS or Linux)

Expected behavior
The compilation should report errors or should pass. It should not crash.

Environment

• OS: macOS 12.4 and Linux (Docker)
• Xcode Version: 14.0 beta 2 (14A5229c)
• Docker image: swiftlang/swift:nightly-5.7-focal (5ea3ea9c2666)

Additional context
I think there are two bugs. There are two commits between __SWIFT_5.7_CRASHER__ and __SWIFT_5.7_CRASHER_WORKAROUND__. One fixes the first issue, the other fixes the other issue.
I don’t know what the issues are though.

I tried reducing the crash but did not succeed.

[slavapestov]

I cannot reproduce the issue with a recent 14.0 beta. It may have been fixed. Do you have a crash log?

[Frizlab]

When compiling with Xcode 14.0 beta 5 (14A5294e), I get this: https://gist.github.com/Frizlab/ce48383e4ef379b7f840eacd883ed632

The gist contains the output when compiling with Xcode directly, and when compiling using the command line with the same Xcode version toolchain (swift build, with Swift version swift-driver version: 1.62.3 Apple Swift version 5.7 (swiftlang-5.7.0.123.8 clang-1400.0.29.50) Target: arm64-apple-macosx12.0).

The crash is reproducible 100% on my side.

I can get the same crash in Xcode than in SPM by workarounding the Xcode crash. See this commit.
The SPM crash is workarounded with this commit.

Neither workarounds are equivalent to the original code; they are simply a removal of the code that make the compiler crash.

[slavapestov]

Ah, looks like a SILGen bug.

[Frizlab]

Still occurring with Xcode 14.0 beta 6 (14A5294g).

[Frizlab]

Seems fixed (I did not get the crash) with toolchain org.swift.57202208291a (Apple Swift version 5.8-dev (LLVM 03bd949eeee4761, Swift 2c40a850df6f409) - Target: arm64-apple-macosx13.0).