User Guide contains confusing information about `-rtsopts` modes.
Currently the user guide section on `-rtsopts` specifies that
-rtsopts=some is the default setting in the text under it, while the specified default is
"[this is the default setting] Enable only the “safe” RTS options: (Currently only
--info.) Any other RTS options on the command line or in the
GHCRTSenvironment variable causes the program with to abort with an error message."
Happy to submit a patch if someone can confirm that
all is actually the default, and that I'm not misunderstanding the meaning here.