[teamleaderleo]

Base red that hides signal: since 241f5ba (PaneMotionBench, "bench, red") the CmuxNext test targets do not compile on feat-cmux-next, so the fast tier stops at "the tests do not build" and no CmuxNextAppTests run on any PR:

PaneMotionBench.swift:152: main actor-isolated static property 'cases' cannot be accessed from outside of the actor

@Test(arguments: cases) evaluates the argument list outside the suite's @MainActor. Case is already Sendable and the list is a constant, so cases is now nonisolated static let. One word; the bench's logic, budgets and its CMUX_PANE_BENCH=1 gate are unchanged.

Verification: fleet package-test-lane.sh at this head with TabMachineColorTests,PaneMotionBench (the bench compiles and stays disabled without the env var; TabMachineColorTests from #24159 has not been able to run since the break).

No capture: test-only change, nothing on screen moves.

Agent session: Air-Blue

🤖 Generated with Claude Code

---

^{Need help on this PR? Tag @codesmith-bot with what you need.}

---

Summary by cubic

Fixes the CmuxNext test target build so CmuxNextAppTests can run on feat-cmux-next again.

PaneMotionBench.cases was main-actor isolated, but @Test(arguments: cases) evaluates its argument list outside the suite's @MainActor, which left the target uncompilable. Case is already Sendable and the list is a constant, so cases is now nonisolated static let. The bench's logic, budgets, and CMUX_PANE_BENCH=1 gate are unchanged.

^{Written for commit d3230f2. Summary will update on new commits.}

[cursor]

Bugbot needs on-demand usage enabled

Bugbot uses usage-based billing for this team and requires on-demand usage to be enabled.

A team admin can enable on-demand usage in the Cursor dashboard.

[github-actions]

cmux status _{(one comment, edited in place; each line is updated by the job that owns it)}

Review d3230f2: HQ feed card · gallery before/after runs · checks

App of this head (app.zip, kept 1 day)

gh workflow run reload-build.yml -R manaflow-ai/cmux --ref feat-cmux-next -f tag=pr24377 -f ref=fix/pane-bench-nonisolated-cases -f platform=macos -f backend_mode=local

red: cmux-next checks (god files, concurrency, crash safety, l10n); NEW: red check: Checks job structure (+1 more) is not red on the base 5890201; do not merge until green; see lane-rules

[teamleaderleo]

Owned by orphan-sweep on air-blue · session

[teamleaderleo]

Review (subagent, correctness first): SHIP at d3230f2

Fresh-context review subagent, code read only. nonisolated static let on a Sendable constant is allowed under the target's settings (Swift 6 mode, MainActor default isolation, InferIsolatedConformances), and it matches the existing pattern for @Test(arguments:) lists in CmuxNext tests: SidebarFooterAlignmentTests.swift:45-55 and SidebarPinnedRowWidthTests.swift:77-93 have exactly this shape, and about 40 other lists are declared the same way. No other error of this kind is in 241f5ba; the only other file it changed is a shell script. Optional, not done: mark struct Case nonisolated too, so the custom test names show when Swift Testing reads them off the main actor. The two existing Sidebar suites don't do that either.

[blacksmith-sh]

Found 9 test failures on Blacksmith runners:

Failures

Test	View Logs
/tmp/tmpfa784deh/summary-missing.json (live):/summary-missing.json (live):	View Logs
/tmp/tmpy0ofg363/summary-fail.json (live):/summary-fail.json (live):	View Logs
[new_workspaces] debug.new_workspace timed 0 of 50 new workspace rows/ [new_workspaces] debug.new_workspace timed 0 of 50 new workspace rows	View Logs
[new_workspaces] the window draws no frames/[new_workspaces] the window draws no frames	View Logs
[tabs] debug.tab_switch timed 0 of 40 switches/ [tabs] debug.tab_switch timed 0 of 40 switches	View Logs
[tabs] the window draws no frames/[tabs] the window draws no frames	View Logs
test_every_part_of_bun_run_check_runs_in_the_warn_branch (main.WebviewsWarnSplitCov ersCheck.test_every_part_of_bun_run_check_runs_in_the_warn_branch)/ test_every_part_of_bun_run_check_runs_in_the_warn_branch (main.WebviewsWarnSplitCov ersCheck.test_every_part_of_bun_run_check_runs_in_the_warn_branch)	View Logs
test_every_submodule_free_checkout_on_an_owned_runner_resets_submodules (main.Reuse dWorkspaceSubmodules.test_every_submodule_free_checkout_on_an_owned_runner_resets_submo dules)/ test_every_submodule_free_checkout_on_an_owned_runner_resets_submodules (main.Reuse dWorkspaceSubmodules.test_every_submodule_free_checkout_on_an_owned_runner_resets_submo dules)	View Logs
test_every_submodule_free_checkout_on_an_owned_runner_resets_submodules (main.Reuse dWorkspaceSubmodules.test_every_submodule_free_checkout_on_an_owned_runner_resets_submo dules) (job='web-bundles')/ test_every_submodule_free_checkout_on_an_owned_runner_resets_submodules (main.Reuse dWorkspaceSubmodules.test_every_submodule_free_checkout_on_an_owned_runner_resets_submo dules) (job='web-bundles')	View Logs

^{Need help on this PR? Tag @codesmith-bot with what you need.}

[teamleaderleo]

Bead cx-e5nw6 created for this PR by the cmux coordinator.