This macro is used a lot for tests to create a ledger path in order to
open a Blockstore. Files will be left on disk unless the test remembers
to call Blockstore::destroy() on the directory. So, instead of requiring
this, use the get_tmp_ledger_path_auto_delete!() macro that creates a
TempDir (which automatically deletes itself when it goes out of scope).
steviez
behzad nouri
Ashwin Sekar
Jeff Biseda