do.call() mangles expressions in arguments (PR#174)

[pd@biostat.ku.dk]

> f<-function(x)x
> f(expression(print("Oops")))
expression(print("Oops"))
> do.call("f",list(expression(print("Oops"))))
[1] "Oops"

Something in the do_docall code causes an extra eval of the
argument. Causes trouble with math expressions in labels in 
boxplot (do.call("title",...))

--please do not edit the information below--

Version:
 platform = i586-unknown-linux
 arch = i586
 os = linux
 system = i586, linux
 status = Patched (unreleased snapshot)
 status.rev = 0
 major = 0
 minor = 64.0
 year = 1999
 month = April
 day = 22
 language = R

Search Path:
 .GlobalEnv, Autoloads, package:base

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