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Re: "use v5.36.0" should imply ASCII source

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From:
Darren Duncan
Date:
August 8, 2021 18:07
Subject:
Re: "use v5.36.0" should imply ASCII source
Message ID:
57d26d57-8c9d-4795-ef74-3538fe8110bf@darrenduncan.net
On 2021-08-08 5:52 a.m., Martijn Lievaart wrote:
> Op 07-08-2021 om 14:15 schreef Darren Duncan:
>> On 2021-08-07 5:01 a.m., Martijn Lievaart wrote:
>>> Op 07-08-2021 om 08:51 schreef Darren Duncan:
>>>> Or even putting aside the POD, is there any real scenario where a single 
>>>> file consisting of only Perl code is in multiple encodings at once?
>>>
>>> Probably not, but ...
>>>
>>>> If there is a "use utf8;" anywhere in a Perl file, would it not be 
>>>> reasonable to interpret that it is describing the entire file and not just 
>>>> the portion of the file below that statement?
>>>
>>> ... I don't feel that is reasonable. It's not how "use" works in general. 
>>> "Use" affects the file being parsed from that point on. If you want it to 
>>> affect the whole file, put it as the first statement.
>>>
>>> But I don't get what you want to achieve, what problem you want to solve with 
>>> this solution?
>>
>> I propose that if we don't want to explicitly support mixed encodings then 
>> explicit encoding declarations are a special case (that can be clearly 
>> documented) where their effect should be retroactive to describe the whole 
>> file, because logically that's the only thing that makes sense (for a non 
>> mixed encoding file, declaring any part of it as UTF-8 is logically saying the 
>> whole file is UTF-8), even if it does happen to have the form of a "use" 
>> statement. -- Darren Duncan
> 
> Well, there actually is one mixed encoding that makes sense, ASCII up until the 
> 'use utf8', Unicode after that. I would assume this is the mental model most 
> people have.

Yes, that is trivially the case.  I was more concerned about mutually 
incompatible encodings, such as non-ASCII Latin1 characters plus non-ASCII UTF-8 
characters in the same file.  -- Darren Duncan

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