I'm convinced by this thread that this issue should be put to bed
forever. I added a note to the design faq issue:
https://github.com/mozilla/rust/issues/4047#issuecomment-33751021
On 01/30/2014 03:20 PM, Benjamin Striegel wrote:
> https://github.com/mozilla/rust/issues/2643
I came here to post that link, you beat me to it. :)
Highly, vehemently, frothing-at-the-mouthly against adding `var` as
sugar for `let mut`. You can see from reading that issue that I too
was once a fan of getting rid of `let mut`, but after using Rust in
the years since I can see how lovely the current setup is. I was the
one who initiated the widespread grepping recently that found that
`let` was three times more common than `let mut`, and I admit I was
surprised to find that immutability was so completely dominant.
Immutability is crucial to Rust. Mutability *must* be explicit. Not
having to ever worry about const-correctness is icing on the cake.
Adding an alternative form for `let mut` would go completely against
the spirit of the language.
On Thu, Jan 30, 2014 at 12:18 PM, Tim Chevalier
<[email protected] <mailto:[email protected]>> wrote:
I'm surprised that no one has mentioned so far that there was a
previous, exhaustive, discussion of this question on github:
https://github.com/mozilla/rust/issues/2643
As far as I can tell, this thread adds nothing new that wasn't already
discussed in the comments on #2643. So that strongly suggests to me
that nothing needs to be changed.
Cheers,
Tim
On Thu, Jan 30, 2014 at 8:49 AM, Steven Fackler
<[email protected] <mailto:[email protected]>> wrote:
> The Zen of Python also says "There should be one-- and
preferably only one
> --obvious way to do it."
>
> Steven Fackler
>
>
> On Thu, Jan 30, 2014 at 11:35 AM, Donaldo Fastoso
> <[email protected] <mailto:[email protected]>>
wrote:
>>
>> I like python's rational of "consenting adults": Give people
the tools
>> to do the right thing, if they still want to hurt themselves,
they may
>> have a good reason, or they are better of dead! ;-)
>>
>> I would argue, that people choosing Rust over C/C++ are choosing it
>> BECAUSE of safety measures like immutability and wouldn't need
>> overbearing lectures.
>>
>> In all honesty it's not the TYPING of three additional chars
"let mut",
>> but the READING. It interrupts the flow of reading, or better: it's
>> a bump in the flow of scanning. Source-Code is not prosa, you
have to
>> actively follow the train of thought and guess the intentions
of the
>> author. So improving READABILITY would really be nice, especially
>> for people coming from other languages. They would probably try to
>> learn by reading the source from experienced programmers.
>>
>> In this case i would also advice against the use of "var", instead
>> of "let mut", but omitting "let" and leave it to "mut" would be
much
>> easier to read and understand.
>>
>> so
>> "let mut x, y;"
>>
>> would become:
>>
>> "mut x;"
>> "let y;"
>>
>> which would take a possible interpretation-ambiguity away from the
>> single "let mut x, y", which can be read either as "let mut" for x
>> and y, or "let mut x" and "let y"!
>>
>> So imho "let mut" has at least two pitfalls:
>> 1) read-bump
>> 2) ambiguity.
>>
>> AFAIK you did a remarkable good job so far, and i have all the
faith
>> you are considering all arguments before coming to a decision.
>>
>> Even if some thoughts of the thoughts come form the bad smelling
>> "lurker"-fraction, which do nothing but making comments about
things they
>> possible can't understand! ;-)
>>
>> Regards,
>> Don
>>
>> _______________________________________________
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>> https://mail.mozilla.org/listinfo/rust-dev
>
>
>
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--
Tim Chevalier * http://catamorphism.org/ * Often in error, never
in doubt
"If you are silent about your pain, they'll kill you and say you
enjoyed it."
-- Zora Neale Hurston
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