Below is an example of output that changed as a result of r64970. I
did not see any NEWS item suggesting this change is expected.
Note that the example is contrived and I don't have a use case for it.
I stumbled across it when playing with recent changes in R relating to
duplication. Does the example use undefined syntax?
-----
fn1 <- function(mylist) {
fn1a <- function() mylist[[c(1,1)]][[1]] <<- 9
fn1a()
return(NULL)
}
fn2 <- function(myarg) fn1(myarg)
test_list <- list(list(list(1)))
print(test_list[[c(1,1,1)]])
fn2(test_list)
print(test_list[[c(1,1,1)]])
-----
Before r64970 the output is
[1] 1
[1] 1
After r64970 the output is
[1] 1
[1] 9
> sessionInfo()
R Under development (unstable) (2014-04-10 r65396)
Platform: x86_64-unknown-linux-gnu (64-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
>
Scott
--
Scott Kostyshak
Economics PhD Candidate
Princeton University
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