From m@ech|er @end|ng |rom @t@t@m@th@ethz@ch  Fri Nov 15 17:59:33 2019
From: m@ech|er @end|ng |rom @t@t@m@th@ethz@ch (Martin Maechler)
Date: Fri, 15 Nov 2019 17:59:33 +0100
Subject: [Rd] _R_CHECK_LENGTH_1_LOGIC2_ setting  and Rstudio ..
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Message-ID: <24014.55669.55430.383436@stat.math.ethz.ch>

>>>>> Martin Maechler 
>>>>>     on Fri, 15 Nov 2019 17:31:15 +0100 writes:

    > as ((strongly recommended by me for package developers !))

    > _R_CHECK_LENGTH_1_CONDITION_=true
    > _R_CHECK_LENGTH_1_LOGIC2_=verbose

Apropos, for many months now, when very occasionally using
Rstudio (notably for teaching to beginners),
I've needed to use a wrapper shell script *unsetting* these,
because otherwise I've got "a bomb" from trying to run Rstudio,
as it internally uses code that fails when
 _R_CHECK_LENGTH_1_LOGIC2_
is activated, see the screen shot (from the very latest
Rstudio 1.2.5019), 
at least in my case where I use a non-trival  'options(repos = ..)'
in my startup.


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[Rd] _R_CHECK_LENGTH_1_LOGIC2_ setting and Rstudio ..
Martin Maechler