[Rd] substitute

[Adrian Dușa]

Dear R wizards,

I have recently been informed about some build errors of my package QCA,
which I was able to trace down to the base function substitute(), with the
following replication example:

foo <- function(x) return(substitute(x))

In the stable R version 4.0.5, I get the expected result:
> foo(A + ~B + C~D)
A + ~B + C ~ D

A different result (the culprit for the build error) occurs under Fedora
with R devel:

> foo(A + ~B + C~D)
A + (~B + C) ~ D

The Fedora machine is the rhub docker image from:
https://hub.docker.com/r/rhub/fedora-gcc-devel

probably very similar to the one signalling the CRAN build error:
https://cran.r-project.org/web/checks/check_results_QCA.html

The first (expected) command is from the stable R version installed on the
same Fedora machine, and I get an identical result on Windows and MacOS.

For some reason, substitute() gives a different result on Debian using gcc,
and on both Fedora systems. I would be grateful for any hint, I am not
entirely certain what I should do about this.

Thank you very much in advance,
Adrian

-- 
Adrian Dusa
University of Bucharest
Romanian Social Data Archive
Soseaua Panduri nr. 90-92
050663 Bucharest sector 5
Romania
https://adriandusa.eu

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