Log sessionInfo too if dump.errors.to.file = TRUE to allow manual loading of required packages

[aryoda]

R dump files (created with save.image) do not contain the packages loaded when the dump file was created and a dump loaded into memory does not use exactly the same search path to find objects during post-mortem debugging.

This means:

1. the program state is not exactly reproducible if objects are stored within a package namespace
2. you cannot step through your source code in a reproducible way after loading the image if your source code calls functions of non-default packages

To allow at least restoring the search path manually before debugging by loading the packages in the correct order the sessionInfo() must be written to the log too.

See also:

• https://stackoverflow.com/questions/15363004/advanced-error-handling
  (save.image doesn't store the "state" of the search path (search() or searchpaths())