Hi, a mild problem here with nested R stuff: <hansl> set R_functions on foreign language=R     ckR2 <- function(){0}     ckR1 <- function(){} end foreign eval R.ckR2()    # works function void wrap(void)     R.ckR2() # works !     # R.ckR1() # would fail end function wrap() R.ckR2() # fails </hansl> So the problem seems to be relatively complex, depending both on the existence of a return value in R and whether or not the call is "on the left-hand side" or within a function. At least it's reproducible, sigh... This is the Nov 22nd snapshot. thanks sven