[Rd] Bug with lists and expressions (PR#589)

[dmurdoch@pair.com]

 I'm running R 1.1.0 for Windows; the behaviour is the same in 1.0.1.

 # create a list containing an expression: no problem
  x _ list(NA, expression(1))

 # Try to assign an expression to a list element, and get an error:
  x[[1]] _ expression(1)

 # Try again with a named list element:  no problem!
  x _ list(a=NA,expression(1))
  x$a _ expression(1)

The error message is: 

Error in "[[<-"(*tmp*, 1, value = expression(1))  :
	incompatible types

I think the error is in "[[<-", but that's a primitive, and I don't
know how to track it down any further.

Duncan Murdoch

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