[Rd] syntax confusion with function/non-function objects (PR#694)

[J.C.Rougier@durham.ac.uk]

I'm just back from a computer practical where we ran into

> "f" <- function(x) 2(x^2) # for 2 * x^2

This definition was taken as legitimate, although using the
function generated the error message

> f(3)
Error in f(3) : attempt to apply non-function

Am I right in thinking that in prevous versions of R this
definition would have been declared as a syntax error?  Surely a
number before an opening parenthesis is always a syntax error?
The other mistake does this:

> "f" <- function(x) 2x^2 # another attempt at 2 * x^2
Error: syntax error

Cheers, Jonathan.

--please do not edit the information below--

Version:
 platform = sparc-sun-solaris2.7
 arch = sparc
 os = solaris2.7
 system = sparc, solaris2.7
 status = 
 major = 1
 minor = 1.1
 year = 2000
 month = August
 day = 15
 language = R

Search Path:
 .GlobalEnv, Autoloads, package:base

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