>> Is this expected behavior? I can't seem to find anything in the help
>> for identical that relates to this.
>>
> It's not in ?identical, but ?Paren gives you some pointers.
> str(quote((a))) and str(quote({a})) are also informative.
Yes, looks like srcrefs are to blame:
x <- quote({ a })
y <- quote({ a })
identical(x, y)
# [1] FALSE
attr(x, "srcref") <- NULL
attr(x, "srcfile") <- NULL
attr(x, "wholeSrcref") <- NULL
attr(y, "srcref") <- NULL
attr(y, "srcfile") <- NULL
attr(y, "wholeSrcref") <- NULL
identical(x, y)
# [1] TRUE
Maybe identical() needs an ignore.srcref option? Normally when
comparing expressions or functions, you want to compare the code, not
it's textual representation.
Hadley
--
http://had.co.nz/
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