Substitute() changed since R2.3.0 (2006-02-02 r37243)?

"Henrik Bengtsson" <hb at maths.lth.se> writes:

Hi,

I've got the following two versions of R on WinXP:

A) R Version 2.3.0 Under development (unstable) (2006-02-02 r37243)
B) R Version 2.3.0 Under development (unstable) (2006-03-27 r37579)

and a the following "test.R" script:

foo <- function(path, ...) { print(path) }
bar <- function(x, ...) foo(...)
wow <- function(x, ...) capture.output(foo(...))
bar(1, path=2)
print(wow(1, path=2))

With A, I get:

source("test.R")

[1] 2
[1] "[1] 2"

But with B, I get

source("test.R")

[1] 2
Error in print(path) : argument "path" is missing, with no default

Further debugging led me to the following test2.R script:

foo <- function(path, ...) { print(path) }
bar <- function(x, ...) foo(...)
wow <- function(x, ...) yaa(foo(...))
yaa <- function(...) substitute(list(...))
bar(1, path=2)
print(wow(1, path=2))

With A, I get

source("test2.R")

[1] 2
list(foo(...))

But with B, I get

source("test.R")

[1] 2
list(foo())

Note that '...' is missing in the latest version.  I don't think this is wanted.

I suspect that you're right. Just for reproduction purposes: The
script is not needed, and the whole thing simplifies to the two lines:

yaa <- function(...) substitute(list(...))
yaa(foo(...))

which gives list(foo()) in 2.3.0 alpha and used to give list(foo(...)).

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