Compilation.update reaches unreachable code

[DonIsaac]

Zig Version

0.14.0

Steps to Reproduce and Observed Behavior

Behavior

test
└─ install generated to bun-test.o
   └─ zig test bun-test Debug aarch64-macos.13.0-none failure
error: thread 45019889 panic: reached unreachable code
???:?:?: 0x109321043 in _Compilation.update (???)
???:?:?: 0x10935f94b in _main.serve (???)
???:?:?: 0x109379dcb in _main.buildOutputType (???)
???:?:?: 0x1092cd01f in _main (???)
???:?:?: 0x19e124273 in ??? (???)
???:?:?: 0x3460ffffffffffff in ??? (???)

error: the following command terminated unexpectedly:
/Users/donisaac/Documents/bun/bun2/vendor/zig/zig test -freference-trace=24 -fllvm -fno-lld -fno-strip -fno-omit-frame-pointer -ODebug -target aarch64-macos.13.0-none -mcpu apple_m1 --dep zlib-internal --dep async --dep ZigGeneratedClasses --dep ResolvedSourceTag --dep ErrorCode --dep runtime.out.js --dep bake-codegen/bake.client.js --dep bake-codegen/bake.error.js --dep bake-codegen/bake.server.js --dep bun-error/index.js --dep bun-error/bun-error.css --dep fallback-decoder.js --dep node-fallbacks/react-refresh.js --dep node-fallbacks/assert.js --dep node-fallbacks/buffer.js --dep node-fallbacks/console.js --dep node-fallbacks/constants.js --dep node-fallbacks/crypto.js --dep node-fallbacks/domain.js --dep node-fallbacks/events.js --dep node-fallbacks/http.js --dep node-fallbacks/https.js --dep node-fallbacks/net.js --dep node-fallbacks/os.js --dep node-fallbacks/path.js --dep node-fallbacks/process.js --dep node-fallbacks/punycode.js --dep node-fallbacks/querystring.js --dep node-fallbacks/stream.js --dep node-fallbacks/string_decoder.js --dep node-fallbacks/sys.js --dep node-fallbacks/timers.js --dep node-fallbacks/tty.js --dep node-fallbacks/url.js --dep node-fallbacks/util.js --dep node-fallbacks/zlib.js --dep completions-bash --dep completions-zsh --dep completions-fish --dep build_options --dep translated-c-headers -Mroot=/Users/donisaac/Documents/bun/bun2/src/unit_test.zig -Mzlib-internal=/Users/donisaac/Documents/bun/bun2/src/deps/zlib.posix.zig -Masync=/Users/donisaac/Documents/bun/bun2/src/async/posix_event_loop.zig -MZigGeneratedClasses=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/ZigGeneratedClasses.zig -MResolvedSourceTag=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/ResolvedSourceTag.zig -MErrorCode=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/ErrorCode.zig -Mruntime.out.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/runtime.out.js -Mbake-codegen/bake.client.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/bake.client.js -Mbake-codegen/bake.error.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/bake.error.js -Mbake-codegen/bake.server.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/bake.server.js -Mbun-error/index.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/bun-error/index.js -Mbun-error/bun-error.css=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/bun-error/bun-error.css -Mfallback-decoder.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/fallback-decoder.js -Mnode-fallbacks/react-refresh.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/react-refresh.js -Mnode-fallbacks/assert.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/assert.js -Mnode-fallbacks/buffer.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/buffer.js -Mnode-fallbacks/console.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/console.js -Mnode-fallbacks/constants.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/constants.js -Mnode-fallbacks/crypto.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/crypto.js -Mnode-fallbacks/domain.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/domain.js -Mnode-fallbacks/events.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/events.js -Mnode-fallbacks/http.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/http.js -Mnode-fallbacks/https.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/https.js -Mnode-fallbacks/net.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/net.js -Mnode-fallbacks/os.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/os.js -Mnode-fallbacks/path.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/path.js -Mnode-fallbacks/process.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/process.js -Mnode-fallbacks/punycode.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/punycode.js -Mnode-fallbacks/querystring.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/querystring.js -Mnode-fallbacks/stream.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/stream.js -Mnode-fallbacks/string_decoder.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/string_decoder.js -Mnode-fallbacks/sys.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/sys.js -Mnode-fallbacks/timers.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/timers.js -Mnode-fallbacks/tty.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/tty.js -Mnode-fallbacks/url.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/url.js -Mnode-fallbacks/util.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/util.js -Mnode-fallbacks/zlib.js=/Users/donisaac/Documents/bun/bun2/build/release-ci/codegen/node-fallbacks/zlib.js -Mcompletions-bash=/Users/donisaac/Documents/bun/bun2/completions/bun.bash -Mcompletions-zsh=/Users/donisaac/Documents/bun/bun2/completions/bun.zsh -Mcompletions-fish=/Users/donisaac/Documents/bun/bun2/completions/bun.fish -Mbuild_options=/Users/donisaac/Documents/bun/bun2/build/release-ci/cache/zig/local/c/1300b61a4f700af0e47ea055f220241f/options.zig -ODebug -target aarch64-macos.13.0-none -mcpu apple_m1 -Mtranslated-c-headers=/Users/donisaac/Documents/bun/bun2/build/release-ci/cache/zig/local/o/2d86c93958694287aa09bee1a3024484/c-headers-for-zig.zig -lc++ -lc --test-runner /Users/donisaac/Documents/bun/bun2/src/main_test.zig -ffunction-sections -fdata-sections -fallow-shlib-undefined --cache-dir /Users/donisaac/Documents/bun/bun2/build/release-ci/cache/zig/local --global-cache-dir /Users/donisaac/Documents/bun/bun2/build/release-ci/cache/zig/global --name bun-test -fno-compiler-rt -fno-ubsan-rt --zig-lib-dir /Users/donisaac/Documents/bun/bun2/vendor/zig/lib/ --listen=- 

I was unfortunately unable to narrow this down to a more minimal repro, sorry about that.

Steps

1. Clone the Bun repo and follow the setup guide in CONTRIBUTING.md
2. Check out this branch
3. (optionally) modify cmake/scripts/DownloadZig.cmake:31 to download a ReleaseSafe build. This is only available on macos aarch64. You could aldo stick your own debug build of the Zig compiler there.

set(ZIG_NAME bootstrap-${ZIG_ARCH}-${ZIG_OS_ABI}-ReleaseSafe)

4. run bun build:ci:test

Additional Information

• Changing the optimize mode has no effect. Happens when compiling for Debug, ReleaseFast, and ReleaseSafe
• Building tests in other cmake profiles works fine. e.g. bun zig:test and bun zig:test:release

Expected Behavior

Code compiles without panicking.