https://luci-logdog.appspot.com/v/?s=infra%2Fswarm%2Fchromium-swarm.appspot.com%2F35bb60009f967911%2F%2B%2Fsteps%2Fpresubmit%2F0%2Fstdout

"""

** Presubmit ERRORS **
tests/masters_recipes_test.py (16.82s) failed
!@@@HONOR_ZERO_RETURN_CODE@@@
!@@@SEED_STEP@setup_build@@@
!@@@STEP_CURSOR@setup_build@@@
!@@@STEP_STARTED@@@
!@@@STEP_LOG_LINE@run_recipe@To repro this locally, run the following line from the root of a 'build' checkout:@@@
!@@@STEP_LOG_LINE@run_recipe@@@@
!@@@STEP_LOG_LINE@run_recipe@./scripts/slave/recipes.py run --properties-file - chromium_trybot <<EOF@@@
!@@@STEP_LOG_LINE@run_recipe@{"dump_builders": "/b/s/w/ir/tmp/tmp6gyUFa.json", "recipe": "chromium_trybot"}@@@
!@@@STEP_LOG_LINE@run_recipe@EOF@@@
!@@@STEP_LOG_LINE@run_recipe@@@@
!@@@STEP_LOG_LINE@run_recipe@To run on Windows, you can put the JSON in a file and redirect the@@@
!@@@STEP_LOG_LINE@run_recipe@contents of the file into run_recipe.py, with the < operator.@@@
!@@@STEP_LOG_END@run_recipe@@@
Running recipe with {'dump_builders': '/b/s/w/ir/tmp/tmp6gyUFa.json', 'recipe': 'chromium_trybot'}
!@@@STEP_TEXT@running recipe: "chromium_trybot"@@@
!@@@STEP_CLOSED@@@
!@@@SEED_STEP@Dump BUILDERS dict@@@
!@@@STEP_CURSOR@Dump BUILDERS dict@@@
!@@@STEP_STARTED@@@
"""

This doesn't work without knowing the contents of the tmp6gyUFa.json, which doesn't appear to be emitted anywhere.