Failed test 'concurrency check'
It seems that t/004_promise_memory_storable.t can sometimes fail like this:
# Failed test 'concurrency check'
# at t/Test/Promise/Me.pm line 168.
# +-----------------+----+-----------------+
# | GOT | OP | CHECK |
# +-----------------+----+-----------------+
# | concurrency 1\n | eq | concurrency 2\n |
# | | | concurrency 1\n |
# +-----------------+----+-----------------+
# Failed test 'concurrency'
# at t/Test/Promise/Me.pm line 170.
# Looks like you failed 1 test of 3.
# Failed test 'Promise using memory and storable serialiser'
# at t/004_promise_memory_storable.t line 51.
# Looks like you failed 1 test of 1.
# Seeded srand with seed '20240105' from local date.
t/004_promise_memory_storable.t ..
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/1 subtests
It happens also on other user's system, for example here: http://www.cpantesters.org/cpan/report/dd28548a-a1d9-11ee-8f2c-12abae080ab9