Compiler crash when throwing from a throws(Never) function

[Jnosh]

Description

Throwing from a throws(Never) function crashes swiftc.

Reproduction

enum MyError: Error {
    case failed
}

func foo() throws(Never) {
    throw MyError.failed
}

Stack dump

Stack dump:
0.	Program arguments: /Users/<user>/Library/Developer/Toolchains/swift-6.0-DEVELOPMENT-SNAPSHOT-2024-04-15-a.xctoolchain/usr/bin/swift-frontend -frontend -c -primary-file main.swift -target arm64-apple-macosx14.0 -Xllvm -aarch64-use-tbi -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk -color-diagnostics -swift-version 6 -empty-abi-descriptor -resource-dir /Users/<user>/Library/Developer/Toolchains/swift-6.0-DEVELOPMENT-SNAPSHOT-2024-04-15-a.xctoolchain/usr/lib/swift -module-name main -target-sdk-version 14.4 -target-sdk-name macosx14.4 -external-plugin-path /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins#/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -external-plugin-path /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/local/lib/swift/host/plugins#/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -plugin-path /Users/<user>/Library/Developer/Toolchains/swift-6.0-DEVELOPMENT-SNAPSHOT-2024-04-15-a.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Users/<user>/Library/Developer/Toolchains/swift-6.0-DEVELOPMENT-SNAPSHOT-2024-04-15-a.xctoolchain/usr/local/lib/swift/host/plugins -o /var/folders/mk/5k70fbgj28g370g9tzg97n_80000gn/T/TemporaryDirectory.p0XXZQ/main-1.o
1.	Apple Swift version 6.0-dev (LLVM c5ac128e678cf31, Swift 59748d9cf60064b)
2.	Compiling with the current language version
3.	While walking into body of 'foo()' (at main.swift:6:1)
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  swift-frontend           0x0000000109906e08 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1  swift-frontend           0x00000001099055d4 llvm::sys::RunSignalHandlers() + 112
2  swift-frontend           0x0000000109907450 SignalHandler(int) + 304
3  libsystem_platform.dylib 0x0000000194407584 _sigtramp + 56
4  libsystem_pthread.dylib  0x00000001943d6c20 pthread_kill + 288
5  libsystem_c.dylib        0x00000001942e3a20 abort + 180
6  swift-frontend           0x0000000105aea868 (anonymous namespace)::Verifier::checkSameType(swift::Type, swift::Type, char const*) + 260
7  swift-frontend           0x0000000105adb334 (anonymous namespace)::Verifier::walkToStmtPost(swift::Stmt*) + 1508
8  swift-frontend           0x0000000105af1544 swift::Stmt* (anonymous namespace)::Traversal::traverse<swift::Stmt>(swift::ASTWalker::PreWalkResult<swift::Stmt*>, llvm::function_ref<swift::Stmt* (swift::Stmt*)>, llvm::function_ref<swift::ASTWalker::PostWalkResult<swift::Stmt*> (swift::Stmt*)>) + 104
9  swift-frontend           0x0000000105af1754 swift::Stmt* llvm::function_ref<swift::Stmt* (swift::Stmt*)>::callback_fn<(anonymous namespace)::Traversal::doIt(swift::Stmt*)::'lambda'(swift::Stmt*)>(long, swift::Stmt*) + 448
10 swift-frontend           0x0000000105af1530 swift::Stmt* (anonymous namespace)::Traversal::traverse<swift::Stmt>(swift::ASTWalker::PreWalkResult<swift::Stmt*>, llvm::function_ref<swift::Stmt* (swift::Stmt*)>, llvm::function_ref<swift::ASTWalker::PostWalkResult<swift::Stmt*> (swift::Stmt*)>) + 84
11 swift-frontend           0x0000000105af3b10 (anonymous namespace)::Traversal::visitAbstractFunctionDecl(swift::AbstractFunctionDecl*) + 660
12 swift-frontend           0x0000000105af28fc (anonymous namespace)::Traversal::visit(swift::Decl*) + 156
13 swift-frontend           0x0000000105aefde4 (anonymous namespace)::Traversal::doIt(swift::Decl*) + 288
14 swift-frontend           0x0000000105aefcb8 swift::Decl::walk(swift::ASTWalker&) + 32
15 swift-frontend           0x0000000105c99344 swift::SourceFile::walk(swift::ASTWalker&) + 196
16 swift-frontend           0x0000000105ad9a6c swift::verify(swift::SourceFile&) + 96
17 swift-frontend           0x0000000105db01e8 swift::TypeCheckSourceFileRequest::cacheResult(std::__1::tuple<>) const + 76
18 swift-frontend           0x00000001057ee98c swift::performTypeChecking(swift::SourceFile&) + 92
19 swift-frontend           0x00000001046f73ac bool llvm::function_ref<bool (swift::SourceFile&)>::callback_fn<swift::CompilerInstance::performSema()::$_7>(long, swift::SourceFile&) + 16
20 swift-frontend           0x00000001046f118c swift::CompilerInstance::forEachFileToTypeCheck(llvm::function_ref<bool (swift::SourceFile&)>) + 76
21 swift-frontend           0x00000001046f1120 swift::CompilerInstance::performSema() + 76
22 swift-frontend           0x00000001044c6d54 withSemanticAnalysis(swift::CompilerInstance&, swift::FrontendObserver*, llvm::function_ref<bool (swift::CompilerInstance&)>, bool) + 60
23 swift-frontend           0x00000001044b81e0 performCompile(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 708
24 swift-frontend           0x00000001044b714c swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 2380
25 swift-frontend           0x00000001042d1a78 swift::mainEntry(int, char const**) + 3096
26 dyld                     0x000000019404e0e0 start + 2360

Expected behavior

The compiler should not crash.

Environment

Apple Swift version 6.0-dev (LLVM c5ac128e678cf31, Swift 59748d9)
Target: arm64-apple-macosx14.0

Additional information

No response