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

[Martin Maechler]

>>>>> Martin Maechler <maechler at stat.math.ethz.ch>
>>>>>     on Mon, 3 Apr 2017 10:22:52 +0200 writes:

>>>>> 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.

In the end, it took two dozens of hours. The change is
    r72478 | maechler | 2017-04-04 11:41:51 +0200 

Martin


    >> 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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