On 12/11/2019 5:01 p.m., William Dunlap via R-devel wrote:
In general R doesn't print the "comment" attribute of an object
> structure(1:3, comment=c("a comment", "another comment"))
[1] 1 2 3
but if the object is a call it prints it in an unusual format
> structure(quote(func(arg)), comment=c("a comment", "another comment"))
a comment
another comment
func(arg)
What is the rationale for the special treatment of calls?
It was there in revision 2 of src/main/deparse.c in 1997. (For those
unfamiliar with R history: the current revision of R is 77405. That
particular file has been revised 248 times since rev 2.)
I suspect either nobody has noticed it before, or nobody had the nerve
to touch it.
Duncan Murdoch
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