[Rd] names lost in functions from packages installed by R-devel r74500

[luke-tierney at uiowa.edu]

On Tue, 3 Apr 2018, Martin Maechler wrote:

>>>>>> Martin Maechler <maechler at stat.math.ethz.ch>
>>>>>>     on Tue, 3 Apr 2018 17:03:02 +0200 writes:
>
>>>>>> Francois Rousset <francois.rousset at umontpellier.fr>
>>>>>>     on Tue, 3 Apr 2018 16:38:42 +0200 writes:
>
>    >> Dear list members,
>    >> If I install with R-devel r74500 on Windows (sessionInfo below) the
>    >> attached 'bugdemo' package with the single function
>
>    >> foo <- function() {
>    >>   named <- c("bar"=TRUE)
>    >>   print(named)
>    >>   return(named)
>    >> }
>
>    >> then run
>
>    >>> bugdemo::foo()
>    >> [1] TRUE
>    >> [1] TRUE
>
>    >> The "bar" name is lost. It is not lost when I define foo in the R
>    >> session instead of using its packaged version.
>
>    >> To reproduce:
>
>    >> =======================================
>
>    >> install.packages("bugdemo_0.1.1.tar.gz",type="source",repos=NULL)
>
>    >> bugdemo::foo()
>
>
>
>    >> =======================================
>
>    >> I also tested whether this was a problem with the "R CMD build" step or
>    >> the "install.packages()" step by building with R 3.4.4 and installing
>    >> with R-devel, and reciprocally, and the problem appears to be in the
>    >> install step of R-devel.
>
>    > Confirmed.
>
>    > It is a bug somewhere between the byte compiler and
>    > (de)serialization .. really beyond my own expertise:
>
>    > If you install  without byte compilation *),  foo() behaves as
>    > expected, i.e., does not "lose" the names.
>
>    > On the other hand, as you mention, if you define foo in the
>    > globalenv, and call it, the JIT kicks in pretty quickly and you
>    > can see that 'foo' is byte compiled as well, but it still does not break.
>
>    > This is pretty important, so thank you very much for the nice
>    > reproducible report!
>
>    > Martin Maechler
>    > ETH Zurich
>
>    > ---
>    > *) R-devel CMD INSTALL --no-byte-compile -l ...
>
> This has been fixed now, both in R-devel (svn rev 74511)
> and in R 3.5.0 alpha (r 74513).
>
> I was wrong in that this was related to (de)serialization.
> Rather I had forgotten that JIT (just in time) compilation and
> explicit compilation may differ in their results.

Actually the difference is that a function defined in a package is
compiled with more optimizations than one defined at session top
level.  A change had broken a piece of the optimization code, and has
now been fixed. Thanks for the report.

Best,

luke

>
> Thank you again for the report!
>
> Martin Maechler
> ETH Zurich
>
>
>
>    >> =============
>
>    >>> sessionInfo()
>    >> R Under development (unstable) (2018-03-31 r74500)
>
>    [ ........... ]
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>

-- 
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa                  Phone:             319-335-3386
Department of Statistics and        Fax:               319-335-3017
    Actuarial Science
241 Schaeffer Hall                  email:   luke-tierney at uiowa.edu
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