A collection of DIPs

[Brian Rogoff via Digitalmars-d]

On Tuesday, 8 September 2015 at 03:09:20 UTC, Rikki Cattermole 
wrote:
> On 08/09/15 5:27 AM, Shammah Chancellor wrote:
>> void main() {
>>     import std.stdio : writeln;
>>     writeln("Hello world!");
>> }
>>
>> -Shammah
>
> It's not just an idiomatic way to code with local imports, it's 
> a compilation performance technique too.

I didn't read the DIP collection thoroughly (yup, D has a some 
grotesqueries that would be nice to fix but I doubt will happen) 
but local imports are one of the nice features of D (and Ada, and 
OCaml) that I wish would be adopted in some other languages, like 
Nim and Julia.

I never thought of them as a performance optimization though. 
What's the reasoning? Are the observed differences significant? 
 From my POV restricting the scope of an import makes local 
reasoning easier. I'd do it even if it were slightly less 
performant!