=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Fetching nim-1.4.2.tar.xz
=> Total size: 4770616 bytes
ftp: Error retrieving file `503 Backend unavailable, connection failed'
fetch: Unable to fetch expected file nim-1.4.2.tar.xz
=> Checksum SHA1 OK for nim-1.4.2.tar.xz
=> Checksum RMD160 OK for nim-1.4.2.tar.xz
=> Checksum SHA512 OK for nim-1.4.2.tar.xz