[Rd] Encourage exit with nonzero error status in ?last.dump

[Scott Kostyshak]

The following example in ?dump.frames

options(error = quote({dump.frames(to.file = TRUE); q()}))

is useful for teaching the user how to save a frame dump when R
encounters an error during non-interactive sessions. This command
however causes an additional change that on encountering an error R
exits with a 0 error status. Although it's just an example, it's an
important one as it's referenced in the 'Details' section of the help
file. I think it would be better to encourage exiting with a nonzero
error status:

options(error = quote({dump.frames(to.file = TRUE); q(status = 1)}))

Scott


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Scott Kostyshak
Economics PhD Candidate
Princeton University