[Rd] Development version of R fails tests and is not installed

[Hugh Parsonage]

The only observation I can make is that the change to round() was made
in r77727 whereas your R-devel appears to be r77715 (so would not
exhibit the fixed behaviour).  My guess is that there was a perpetual
installation failure after r77715 but that the test folder was still
retrieved and used.

On Sat, 8 Feb 2020 at 19:27, Berwin A Turlach <berwin.turlach using gmail.com> wrote:
>
> G'day all,
>
> I have daily scripts running to install the patched version of the
> current R version and the development version of R on my linux box
> (Ubuntu 18.04.4 LTS).
>
> The last development version that was successfully compiled and
> installed was "R Under development (unstable) (2020-01-25 r77715)" on
> 27 January.  Since then the script always fails as a regression test
> seems to fail.  Specifically, in the tests/ subdirectory of my build
> directory I have a file reg-tests-1d.Rout.fail which ends with:
>
> > ## more than half of the above were rounded *down* in R <= 3.6.x
> > ## Some "wrong" test cases from CRAN packages (partly relying on wrong R <= 3.6.x behavior)
> > stopifnot(exprs = {
> +     all.equal(round(10.7775, digits=3), 10.778, tolerance = 1e-12) # even tol=0, was 10.777
> +     all.equal(round(12345 / 1000,   2), 12.35 , tolerance = 1e-12) # even tol=0, was 12.34 in Rd
> +     all.equal(round(9.18665, 4),        9.1866, tolerance = 1e-12) # even tol=0, was  9.1867
> + })
> Error: round(10.7775, digits = 3) and 10.778 are not equal:
>   Mean relative difference: 9.27902e-05
> Execution halted
>
> This happens while the 32bit architecture is installed,  which is a bit
> surprising as I get the following results for the last installed
> version of R's development version:
>
> R Under development (unstable) (2020-01-25 r77715) -- "Unsuffered Consequences"
> Copyright (C) 2020 The R Foundation for Statistical Computing
> Platform: x86_64-pc-linux-gnu/32 (32-bit)
> [...]
> > round(10.7775, digits=3)
> [1] 10.778
>
> and
>
> R Under development (unstable) (2020-01-25 r77715) -- "Unsuffered Consequences"
> Copyright (C) 2020 The R Foundation for Statistical Computing
> Platform: x86_64-pc-linux-gnu/64 (64-bit)
> [...]
> > round(10.7775, digits=3)
> [1] 10.778
>
>
> On the other hand, the R 3.6.2 version, that I mainly use at the moment,
> gives the following results:
>
> R version 3.6.2 (2019-12-12) -- "Dark and Stormy Night"
> Copyright (C) 2019 The R Foundation for Statistical Computing
> Platform: x86_64-pc-linux-gnu/32 (32-bit)
> [...]
> > round(10.7775, digits=3)
> [1] 10.777
>
> and
>
> R version 3.6.2 (2019-12-12) -- "Dark and Stormy Night"
> Copyright (C) 2019 The R Foundation for Statistical Computing
> Platform: x86_64-pc-linux-gnu/64 (64-bit)
> [...]
> > round(10.7775, digits=3)
> [1] 10.777
>
>
> So it seems as if the behaviour of round() has changed between R 3.6.2
> and the development version.  But I do not understand why this test all
> of a sudden failed if the results from the last successfully installed
> development version of R suggest that the test should be passed.
>
> Thanks in advance for any insight and tips.
>
> Cheers,
>
>         Berwin
>
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