[R] 'callNextMethod' in a '[<-' function does not work ?

[cgenolin]

Hi the list,

I try to use callNextMethod in a setteur ([<-) but it does not work. 
Any raison ?
Any other option ?

--- 8< ------------------
### Class B0 ###
setClass("B0" , representation(b0 = "numeric"))
setReplaceMethod("[","B0",function(x,i,j,value){x at b0 <- -value})

a <- new("B0")
a at b0 <- 3
a
a["b0"] <- 3
a


### Class B1 ###
setClass("B1", representation(b1 = "character"), contains = "B0")
setReplaceMethod("[","B1",function(x,i,j,value){
  value <- value*2
  callNextMethod()
})

b <- new("B1")
try(b["b0"] <- 5)
--- 8< ------------------

Christophe

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