[Rd] Potential bug in utils::citation()

[Martin Maechler]

>>>>> Zhian Kamvar <zkamvar at gmail.com>
>>>>>     on Sun, 2 Apr 2017 16:26:37 -0500 writes:

    > Hi, I believe the function utils::citation() will fail if
    > the package specified has two or more citation entries in
    > the current R-devel. The following error is issued:

    > 'missing' can only be used for arguments

    > I have created a working example on github [0] that is
    > build using R-devel on travis-ci [1]. Jim Hester has
    > potentially identified [2] the source of the problem as
    > being from a commit on the 27th [3, 4]. I do not have
    > R-devel built on my machine, but I believe this error can
    > be reproduced on the current R-devel with:

    > if (require("boot") & require("utils"))
    >    utils::citation("boot")

Correct: it does reproduce the new bug.... 
and that is due to a change by me, and I had started investigation
on Friday (but not with your package and not having seen a
straighforward example yet).

This will be fixed ASAP, i.e., within hours.
Martin Maechler

    > Background:

    > My package poppr suddenly started failing check on R-devel
    > during a weekly travis-ci job [5] due to the error
    > above. Another package of mine, ezec, passed [6]. Both
    > contain calls to utils::citation() within the vignettes,
    > but poppr has two citations and ezec only has one (called
    > from another package).

    > Thanks, Zhian

    > [0]: https://github.com/zkamvar/citest [1]:
    > https://travis-ci.org/zkamvar/citest/jobs/217874351 [2]:
    > https://github.com/wch/r-source/commit/7890e9e87d44f85ab76c0e786036a191eacd71d1
    > [3]: https://svn.r-project.org/R/trunk@72419 [4]:
    > https://github.com/wch/r-source/commit/7890e9e87d44f85ab76c0e786036a191eacd71d1
    > [5]:
    > https://travis-ci.org/grunwaldlab/poppr/jobs/216452458
    > [6]: https://travis-ci.org/grunwaldlab/ezec/jobs/216452916

    > -----
    > Zhian N. Kamvar, Ph. D.  Postdoctoral Researcher (Everhart
    > Lab) Department of Plant Pathology University of
    > Nebraska-Lincoln

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