arc patch broken by a recent diff of mine
:-(- D25333
Trace:
```
>>> [18] (+4,422) <exec> $ git show -s --format='%H' 9d512595c0e2a37bb50097f3494af806b8322d45 --
<<< [18] (+4,435) <exec> 12,510 us
>>> [19] (+4,473) <exec> $ git apply --whitespace nowarn --index --reject -- /private/var/folders/m3/rln12jbn4wj3m22zhq06r93r0000gp/T/8lxb42z1158ocowc/26015-ZFFbuA
Checking patch src/applications/differential/storage/__tests__/DifferentialChangesetTestCase.php...
Checking patch src/applications/differential/storage/DifferentialChangeset.php...
Checking patch src/__phutil_library_map__.php...
Applied patch src/applications/differential/storage/__tests__/DifferentialChangesetTestCase.php cleanly.
Applied patch src/applications/differential/storage/DifferentialChangeset.php cleanly.
Applied patch src/__phutil_library_map__.php cleanly.
<<< [19] (+4,496) <exec> 23,084 us
>>> [20] (+4,496) <exec> $ git submodule update --init --recursive
<<< [20] (+4,553) <exec> 56,108 us
>>> [21] (+4,553) <http> https://we.phorge.it/api/differential.getcommitmessage
<<< [21] (+4,751) <http> 197,433 us
[2023-08-11 16:57:57] EXCEPTION: (ConduitClientException) ERR-CONDUIT-CORE: <differential.getcommitmessage> "Phobject" class "DifferentialTestCommitMessageField" must define a "FIELDKEY" constant. at [<arcanist>/src/conduit/ConduitFuture.php:70]
arcanist(head=master, ref.master=788098096e11), phorge(head=arcpatch-D25323_1, ref.master=8310591523f5, ref.arcpatch-D25323_1=9d512595c0e2)
#0 ConduitFuture::didReceiveResult(array) called at [<arcanist>/src/future/FutureProxy.php:40]
#1 FutureProxy::isReady() called at [<arcanist>/src/future/Future.php:63]
#2 Future::updateFuture() called at [<arcanist>/src/future/FutureIterator.php:224]
#3 FutureIterator::next() called at [<arcanist>/src/future/FutureIterator.php:190]
#4 FutureIterator::rewind()
#5 iterator_to_array(FutureIterator) called at [<arcanist>/src/future/FutureIterator.php:84]
#6 FutureIterator::resolveAll() called at [<arcanist>/src/future/Future.php:47]
#7 Future::resolve() called at [<arcanist>/src/conduit/ConduitClient.php:65]
#8 ConduitClient::callMethodSynchronous(string, array) called at [<arcanist>/src/workflow/ArcanistPatchWorkflow.php:891]
#9 ArcanistPatchWorkflow::getCommitMessage(ArcanistBundle) called at [<arcanist>/src/workflow/ArcanistPatchWorkflow.php:750]
#10 ArcanistPatchWorkflow::run() called at [<arcanist>/src/workflow/ArcanistPatchWorkflow.php:399]
#11 ArcanistPatchWorkflow::run() called at [<arcanist>/scripts/arcanist.php:427]
<<< [1] (+4,830) <exec> 4,830,164 us
```