pure-cdb test suite failure

As seen on stackage build server:

[1 of 1] Compiling Main             ( t/Test.hs, dist/build/Test/Test-tmp/Main.o )
Linking dist/build/Test/Test ...
> /tmp/stackage-build14/pure-cdb-0.1.2$ dist/build/Test/Test
-- removeRecursiveSafely: unmounting /tmp/pure_cdb_XZwyI05/j.out
umount: /tmp/pure_cdb_XZwyI05/j.out: not mounted
1..13
ok 1
ok 2
ok 3
ok 4
ok 5
ok 6
ok 7
ok 8
ok 9
ok 10
ok 11
ok 12
ok 13
Test: Failure: umount -l /tmp/pure_cdb_XZwyI05/j.out -> 1
CallStack (from HasCallStack):
  error, called at ./System/Unix/Directory.hs:98:32 in Unixutils-1.54.1-3a5kExw9X2GKGKVppdncEz:System.Unix.Directory

bosu / pure-cdb

pure-cdb test suite failure #5