Re: f.close() vs f:close()

[Bernd Eggink <monoped@...>]

Am 02.02.2017 um 16:08 schrieb Viacheslav Usov:
> If f is variable holding the IO library's file object, then, to close 
> the file, one needs to say f:close().
>
> Note the reference manual documents only this use, with the colon syntax.
>
> One, however, could also write f.close(). It is a pretty simple error to 
> make, as I just learned from a colleague. What is the effect of that?
>
> The reference manual does not say.
>
> Looking at the implementation, what seems to happen is that the standard 
> output handle gets closed instead! I'd say this is a bug.

Which Lua version are you using? Under 5.3.4 this returns nil and an 
error message: "cannot close standard file". One could argue about the 
message, but actually nothing is closed.

- Bernd