My eyes has just been opened. Silly me, I get it now. Thank you very much.

May I ask which section in the Language Specification 
<https://golang.org/ref/spec> mention this allowance of int (or float64, 
... etc.) for use as identifier names?

On Saturday, August 12, 2017 at 1:30:04 AM UTC+7, Ian Lance Taylor wrote:
>
> On Fri, Aug 11, 2017 at 11:03 AM, Penguin Enormous 
> <kimkh...@gmail.com <javascript:>> wrote: 
> > 
> > I think that there is inconsistency in the way Go compiler report error 
> > regarding name/unnamed parameters. This is a bit hard for me to explain 
> in 
> > words so please check out this short snippet first: 
> > 
> > https://play.golang.org/p/Sg0DtCtgF2 
> > 
> > Is this unexpected behavior or it's just me that's feeling strange? 
>
> Go does not permit mixing named and unnamed parameters in a parameter 
> list. 
>
> In a declaration like Run(int, f float64) you have two parameters of 
> type `float64`.  The first parameter is named `int` and the second 
> parameter is named `f`.  (The essential point here, of course, is that 
> in Go `int` is not a keyword, and it's OK, though weird, to have a 
> parameter or variable named `int`). 
>
> Ian 
>

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