Obscure message "No release visited in round 3"

[stcarrez]

In my spdx-tool project which contains several nested crates, I've obtained this obscure message:

cd tools && alr build -- -XBUILD=coverage
error: No release visited in round 3                                  
error: alr encountered an unexpected error, re-run with -d for details.

Running with -d option does not help at all.

I suspect that the alire directory was not updated or correct and a minor edit of the alire.toml file triggered some update that solved the issue.

May be a suggestion like Try running alr update would help users faced to this very obscure message.

One possibility that explained why I reached that situation, is that the parent crate (referred to by using spdx_tool = { path='..' } had a new depends-on that was not (yet) taken into account by the child crate.