Bug in crate function

[sebffischer]

library(mlr3misc)

l = list(a = 1)

crate(function() print(a), a = l$a)
#> Error in vapply(.x, .f, FUN.VALUE = .value, USE.NAMES = FALSE, ...): values must be length 1,
#>  but FUN(X[[2]]) result is length 3

^{Created on 2023-08-27 with reprex v2.0.2}

[sebffischer]

Ok this is no bug I think but at least something that can be improved

[mb706]

The way crate() is set up currently is that it only passes along variables from the surrounding environment to the crated environment. The benefit here is that the static code check done by R CMD check will not have any problems with this.

If crate() allowed what you are doing in your code, the code checker would admonish that the function() is referencing a non-existent variable a. crate() forcing you to write it as follows is therefore a good thing:

library(mlr3misc)

l = list(a = 1)

a = l$a
crate(function() print(a), a)

[sebffischer]

thx!