=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Fetching async_kernel-0.12.0.tar.gz
=> Total size: 131864 bytes
=> Checksum SHA1 OK for async_kernel-0.12.0.tar.gz
=> Checksum RMD160 OK for async_kernel-0.12.0.tar.gz
=> Checksum SHA512 OK for async_kernel-0.12.0.tar.gz