Steps to reproduce

The py-jupyter-server package contains the following constraint:

depends_on('py-jupyter-packaging@0.9:1', type=('build', 'run'), when='@1.10.2:')

However, this should actually be:

depends_on('py-jupyter-packaging@0.9:0', type=('build', 'run'))

If you make this change, you'll be able to reproduce the following issue.

Error message

With the package on its own, the concretizer chooses the right thing:

$ spack spec py-jupyter-server
...
py-jupyter-server@1.11.2%apple-clang@12.0.0 arch=darwin-catalina-ivybridge
...
    ^py-jupyter-packaging@0.10.6%apple-clang@12.0.0 arch=darwin-catalina-ivybridge

However, with a package that depends on both, you get an invalid solve:

$ spack spec py-cinemasci
...
            ^py-jupyter-packaging@0.7.12%apple-clang@12.0.0 arch=darwin-catalina-ivybridge
...
                ^py-jupyter-server@1.11.2%apple-clang@12.0.0 arch=darwin-catalina-ivybridge

This prevents GitLab CI from building correctly in #27798.

Information on your system

• Spack: 0.17.0-445-f81d84dfc6
• Python: 3.8.12
• Platform: darwin-catalina-ivybridge
• Concretizer: clingo

General information

• I have run spack debug report and reported the version of Spack/Python/Platform
• I have searched the issues of this repo and believe this is not a duplicate
• I have run the failing commands in debug mode and reported the output