[Rd] match()/%in% with language objects?

[Ben Bolker]

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  I haven't yet dug into the internals of match() yet to see what's
going on, but I'm wondering whether there's a design reason why I
can't use %in% (which is a wrapper for match()) on language objects.

I'd like to test whether a language object is in a list of language
objects, but I get the error "'match' requires vector arguments":

specials <- c("foo","bar")
spList <- lapply(specials,as.name)  ## convert to language objects
"a" %in% spList  ## works (FALSE)
spList[[1]] %in% spList ##   'match' requires vector arguments
quote(foo) %in% spList  ## ditto
quote(foo) == spList[[1]]  ## TRUE

obviously I can go the other way, converting my target into text:

deparse(spList[[1]]) %in% specials  ## TRUE

 I could also write my own function to loop through the list and stop
when I find it.  But I'd prefer to use built-in functionality if possible.

  Does anyone have any clues/see what I'm missing?

  cheers
    Ben Bolker
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