Duncan that does indeed look to be the case. Many thanks!

In particular, tests/reg-tests-1d.R optionally loads the Matrix namespace which allows the test to succeed. Compare:

   ~/R-rc_2019-04-21_r76409/bin/Rscript -e "options(warn=2);
   library(Matrix); res <- findMethods('isSymmetric'); print('success')"
   [1] "success"

versus

   ~/R-rc_2019-04-21_r76409/bin/Rscript -e "options(warn=2); res <-
   findMethods('isSymmetric'); print('success')"
   Error in findMethods("isSymmetric") :
      (converted from warning) non-generic function 'isSymmetric' given
   to findMethods()
   Execution halted


On 4/21/19 7:47 PM, Duncan Murdoch wrote:

Likely the problem is that you don't have the recommended packages loaded.  When I was running tests regularly, they were required. Later, I think they became optional.  Perhaps a new test has been added that once again assumes the required packages are installed.

Duncan Murdoch


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