It seems that devtools::load_all() does not load exported S3methods. I noticed that recently. However I'm not sure that's because I moved from R 4.0.3 to R 4.0.4.
A reprex is difficult in that situation, so I post here the content of the package:
R/test.R
#' @export
test <- function(x){
UseMethod(x)
}
#' @export
test.default <- function(x){
x^2
}
#' @export
test.character <- function(x){
cat(x)
}
DESCRIPTION
Package: test
Type: Package
Title: What the Package Does (Title Case)
Version: 0.1.0
Author: Who wrote it
Maintainer: The package maintainer <yourself@somewhere.net>
Description: More about what it does (maybe more than one line)
Use four spaces when indenting paragraphs within the Description.
License: What license is it under?
Encoding: UTF-8
LazyData: true
RoxygenNote: 7.1.1
NAMESPACE
# Generated by roxygen2: do not edit by hand
S3method(test,character)
S3method(test,default)
export(test)
inst/script.R
devtools::load_all()
test("test.character")
#> Error in UseMethod(x) : no applicable method for 'test.character' applied to an object of class "character"
test.character("test.character")
#> test.character
test(25)
#> Error in UseMethod(x) : 'generic' argument must be a character string
test.default(25)
#> 625
Session info
─ Session info ───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
setting value
version R version 4.0.4 (2021-02-15)
os Ubuntu 20.10
system x86_64, linux-gnu
ui RStudio
language (EN)
collate fr_FR.UTF-8
ctype fr_FR.UTF-8
tz Europe/Paris
date 2021-03-02
─ Packages ───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
package * version date lib source
assertthat 0.2.1 2019-03-21 [1] CRAN (R 4.0.2)
cachem 1.0.4 2021-02-13 [1] CRAN (R 4.0.3)
callr 3.5.1 2020-10-13 [1] CRAN (R 4.0.3)
cli 2.3.1 2021-02-23 [1] CRAN (R 4.0.4)
crayon 1.4.1 2021-02-08 [1] CRAN (R 4.0.3)
desc 1.2.0 2018-05-01 [1] CRAN (R 4.0.2)
devtools 2.3.2 2020-09-18 [1] CRAN (R 4.0.4)
ellipsis 0.3.1 2020-05-15 [1] CRAN (R 4.0.2)
fastmap 1.1.0 2021-01-25 [1] CRAN (R 4.0.3)
fs 1.5.0 2020-07-31 [1] CRAN (R 4.0.2)
glue 1.4.2 2020-08-27 [1] CRAN (R 4.0.2)
lifecycle 1.0.0 2021-02-15 [1] CRAN (R 4.0.3)
magrittr 2.0.1 2020-11-17 [1] CRAN (R 4.0.3)
memoise 2.0.0 2021-01-26 [1] CRAN (R 4.0.3)
pkgbuild 1.2.0 2020-12-15 [1] CRAN (R 4.0.3)
pkgload 1.2.0 2021-02-23 [1] CRAN (R 4.0.4)
prettyunits 1.1.1 2020-01-24 [1] CRAN (R 4.0.2)
processx 3.4.5 2020-11-30 [1] CRAN (R 4.0.3)
ps 1.6.0 2021-02-28 [1] CRAN (R 4.0.4)
purrr 0.3.4 2020-04-17 [1] CRAN (R 4.0.2)
R6 2.5.0 2020-10-28 [1] CRAN (R 4.0.3)
remotes 2.2.0 2020-07-21 [1] CRAN (R 4.0.2)
rlang 0.4.10 2020-12-30 [1] CRAN (R 4.0.3)
rprojroot 2.0.2 2020-11-15 [1] CRAN (R 4.0.3)
sessioninfo 1.1.1 2018-11-05 [1] CRAN (R 4.0.2)
testthat 3.0.2 2021-02-14 [1] CRAN (R 4.0.3)
usethis 2.0.1 2021-02-10 [1] CRAN (R 4.0.4)
withr 2.4.1 2021-01-26 [1] CRAN (R 4.0.3)
[1] /home/kevin/R/x86_64-pc-linux-gnu-library/4.0
[2] /usr/local/lib/R/site-library
[3] /usr/lib/R/site-library
[4] /usr/lib/R/library