Possibly just a symptom of the earlier behavior, but I'll amend my example, below, with an even more disturbing observation:
Am Sat, 23 May 2020 13:19:24 +0200
schrieb Thomas Friedrichsmeier via R-devel <r-devel@r-project.org>:
[...]
> Consider the code below:
>
> makeActiveBinding("i",
> function(value) {
> if (missing(value)) {
> x
> } else {
> print("set")
> x <<- value
> }
> }, globalenv())
>
> i <- 1 # output "set"
> print(i) # output [1] 1
>
> # Surprising behavior starts here:
> for(i in 2:3) print(i) # output [1] "set"
> # NULL
> # NULL
>
> print(i) # output NULL
> print(x) # output NULL
>
> i <- 4 # output "set"
> print(i) # ouput [1] 4
> print(x) # ouput [1] 4
ls()
# Error in ls() :
# Value of SET_STRING_ELT() must be a 'CHARSXP' not a 'NULL'
Regards
Thomas
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