$ pwd
/builds/jhf/functionary
$ ls -lt Cargo.toml
-rw-rw-rw- 1 root root 1431 Oct 22 17:18 Cargo.toml
$ ls -ld .
drwxrwxrwx 21 root root 4096 Oct 22 17:30 .
$ head -1 Cargo.toml
###
$ CARGO_LOG="cargo=trace" cargo -vv --verbose --verbose clean
[2019-10-22T17:31:41Z DEBUG cargo] exit_with_error; err=CliError { error: Some(ErrorMessage { msg: "could not find `Cargo.toml` in `/builds/jhf/functionary` or any parent directory" }), unknown: false, exit_code: 101 }
error: could not find `Cargo.toml` in `/builds/jhf/functionary` or any parent directory