[ESS] crtl cc on a short function

[markleeds at verizon.net]

When I use control cc on a function such as below,

mindiff <- function(df) df[which.min(df$diff), ]

only the

mindiff <- function(df) df

part gets recognized by R so the function does nothing.

But, if  I put squiggly brackets around the same function , as in

mindiff <- function(df) { df[which.min(df$diff), ] }

then everything works fine. If this not something that can be fixed by 
setting ESS options, then that's okay and I'll always put the squiggly 
brackets. But, if it can be fixed and someone knows what to put in my 
init.el, that would be great. thanks.