Re: [ANN] Lua 5.4.0 (alpha) now available
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- Subject: Re: [ANN] Lua 5.4.0 (alpha) now available
- From: Paul Ducklin <pducklin@...>
- Date: 2019年6月23日 12:36:28 +0000
>>Sorry, I meant that there is no integration
>>with generic for loop and the toclose variables
>But this integration does exist.
>Why do you think it does not?
Because it isn’t documented well.
It should be explained more clearly in the manual and should *definitely be listed* amongst the significant changes from 5.3.5 to 5.4.0.
(The minor change in integer for loops is listed as a major change but the major change in generic for loops isn’t listed at all.)
>io.lines("file") now returns 4 values:
>readline_func, nil, nil, file where the readline_func
>is a closure that returns the next line from the
>file, and "file" is the filehandle that was opened,
>which will be closed via its __close metamethod.
This is one of only two places in the whole Lua codebase, and is the only library function, where __close is used (in both cases the code just sets __close = __gc).
Yet the manual fails to mention it at all.
Everyone who was around and concentrating on this list when __close was discussed probably knows all this stuff, but how is anyone else supposed to find out?
I grepped through the code, but I shouldn’t have had to.