The warning message in the last line of this email is incorrect.
This is behavior which Duncan Murdoch labeled a bug in
https://stat.ethz.ch/pipermail/r-help/2017-December/450494.html
This is a fresh install of R-devel (2018-03-21 r74436)
R Under development (unstable) (2018-03-21 r74436) -
>From a small thread over at the 'R-package-devel' mailing list,
this now goes to the R-devel mailing list
(CC'ing the original R-package-devel very exceptionally).
Note that I, as maintainer("Matrix") had introduced rBind() and
cBind() to be used for Matrix package matrices as substitute for
rb
