R-alpha: New version of R for testing

[Ross Ihaka]

Peter Dalgaard BSA writes:
 > Ross Ihaka <ihaka@stat.auckland.ac.nz> writes:
 > 
 > > NEW FEATURES
 > > 
 > >  o  "expressions" are now implemented as a basic type rather than as
 > >     a class of object.  This change was made as move toward compatibility
 > >     with S and also to implement mathematical annotation in graphs.
 > 
 > Something looks wrong:
 > 
 > > expression(2+2)
 > expression(2 + 2)
 > > expression(2+2)[[1]]
 > expression(2 + 2)
 > > expression(2+2)[[1]][[1]]
 > expression(2 + 2)
 > 
 > - How the blazes is a poor soul supposed to get at the parse tree for
 > an expression? According to the docs, an expression is supposed to be
 > a list of calls, but obviously

Oops sorry.  Incomplete implementation.  I have a fix for this now as
will as fixes for mutations of expressions of the form

	> e <- expression(x+y)
	> e[[1]][[1]] <- as.name("f")

I hope to have patches and an "a2" release later this week.
	Ross
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