doneWithMsgThrowTo has invalid ASSERT when n_capabilities==1
I saw this assert fail in test foreigninterruptible
when running with stage1.ghc-bin.ghc.link.opts += -debug
in hadrian.settings
stack trace is lost to the ether, but note maybePerformBlockedException
calls lockClosure
, then doneWithMsgThrowTo
. lockClosure
doesn't reallyLockClosure
when n_capabilities == 1
, so the assertion is triggered.