this derivation will be built:
  /nix/store/swnz994ms0q0z7ypgzcmfjqxyqdfkkdf-treefmt-check.drv
warning: unable to download 'https://cache.clan.lol/iif46kfrzxs8cdh81s3kc55s7zm64mfa.narinfo': HTTP error 503

response body:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Error>
    <Code>SlowDown</Code>
    <Message>Service unavailable, please try again later.</Message>
</Error>; retrying in 3976 ms (attempt 1/5)