Thanks to Kit Baum, -ivpois- on SSC is updated:
ssc inst ivpois, replace
to intall the latest version.
The update corrects a silly bug introduced in the last release: when
the varlist was long, variables were dropped thanks to a line:
loc ok=r(varlist)
which should have read
loc ok `r(varlist)'
Thanks to Michael Makowsky for reporting the bug!
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