GeezerVison

Eigen 5.0.0, which we are trying to bring to CRAN in an updated RcppEigen, did away with Eigen::all (and Eigen::MappedSparseMatrix), see the release notes (fourth bullet point under breaking changes for 'all'). (Also note that they changed the versioning scheme so Eigen 5.0.0 corresponds to 3.5.0 under the old scheme.) See RcppEigen issue 151 for all the changes related to this upgrade.

For Eigen::all, it appears that the preceding Eigen 3.4.0 introduced Eigen::indexing::all (see its release notes) and that is still available in 5.0.0 too. So this PR replaces one Eigen::all with Eigen::indexing::all. We verified that this passes with both the current RcppEigen on CRAN, and the release candidate in our master branch. For MappedSparseMatrix, a change to Map works. No other changes are made in the PR.

So if you could apply this PR and get the update to CRAN before we update, a new RcppEigen would not break your package. If you don't update it we would get breakage 😞 but this PR overcomes this. We have been at this update for a long time as there were other issues in affected packages so the upload is not really imminent -- but getting closer. If you can get this to CRAN over the next few weeks we would appreciate it.