On Monday, 12 September 2016 08:57:15 UTC-4, Markus Zimmermann wrote:
>
> Hi gophers!
>
> I am wondering why we have a "declared and not used" compile error for 
> variables [https://play.golang.org/p/KLzHVO5L7q] but not for constants [
> https://play.golang.org/p/JG9dSa_VKg]? I am sure there is some rational 
> decision behind this that I have missed, but my Google-fu is just not 
> strong enough to find an answer.
>

I suspect the answer is: because unused constants and types cost nothing at 
run time.  It's not that simple, of course, because constant and type 
declarations may be the only uses of an import of a package whose 
initialization has some cost; but this is quite marginal.

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