invalid table index

[Dmitriy Iassenev <iassenev@...>]

if we try to assign

   b[nil] = {}
   
then we get error 'table index is invalid',
but if we try

    if b[nil] == nil then
       ...
    end
    
no error is raised. Is it correct behaviour?

-- 
Best regards,
 Dmitriy                            mailto:iassenev@gsc-game.kiev.ua