[datatable-help] Environment of eval() execution for "j" appears to vary inexplicably

[Matthew Dowle]

The infinite recursion error when data.table has the wrong class is now
caught :

> DT = data.table(a=1:3,key="a")
> class(DT) = "data.table"
> DT[J(2)]   # previously resulted in 'infinite recursion'
Error in dimnames.data.table(x) : 
  data.table inherits from data.frame (from v1.5) but this data.table does
not. Has it been created manually (e.g. by using 'structure' rather than
'data.table') or saved to disk using a prior version of data.table? The
correct class is c('data.table','data.frame').
> 

Matthew


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