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A general description is here.
The internal code for changing the parent of an environment now signals an error if the new parent is not an environment or if the change would create a cycle in the parent chain.
‘R CMD check’ now reports as warnings what ‘gfortran’ calls ‘Fortran 2018 deleted features’, all of which have long been marked as ‘obsolescent’ and some of which were deleted in Fortran 2008 or earlier. Fortran compilers are no longer required to support these.
Package ‘tools’' ‘toTitleCase(ch0)’ now returns ‘character(0)’ when ‘ch0’ is of zero length; fixing PR#18724, reported by David Hugh Jones.