Re: BUG in table.concat

[Andreas Weis <der_ghulbus@...>]

Leo Razoumov schrieb:
> I am quite surprised that the following code crashes Lua-5.1.2 and
> Lua-5.1.3 (luajit)
>
>   
> > print( table.concat({[1]=1, [2]=2, [4]=4}, '/') )
> >     
Sorry for hijacking, but I noticed that

print( table.concat({1, 2, [4]=4}, '/') )


also works fine. Since the Lua Manual (§2.5.7) reads

Finally, fields of the form |exp| are equivalent to |[i] = exp|, where 
|i| are consecutive numerical integers, starting with 1.

I expected the code to construct a table identical to the one from 
above. Am I missing something?

Regards,
Andreas


Leo Razoumov schrieb:
> I am quite surprised that the following code crashes Lua-5.1.2 and
> Lua-5.1.3 (luajit)
>
>   
> > print( table.concat({[1]=1, [2]=2, [4]=4}, '/') )
> >     
>
> stdin:1: bad argument #1 to 'concat' (table contains non-strings)
> stack traceback:
>         [C]: in function 'concat'
>         stdin:1: in main chunk
>         [C]: ?
>   
>
> The table above has a single hole (missing t[3]). Official reference
> manual is silent about this case. Is it a bug?
>
> On the other hand, why does the following code works
>
>   
> > print( table.concat({[1]=1, [3]=3,  [5]=4}, '/') )
> >     
> 1
>   
>
> The last example also has 2 holes (t[2],t[4]) but it works. Go figure:-)
>
> --Leo--
>