Reason for 'static struct'

Jon D via Digitalmars-d-learn digitalmars-d-learn at
Wed Dec 9 13:10:43 PST 2015

There is a fair bit of range related code in the standard library 
structured like:

     auto MyRange(Range)(Range r)
         if (isInputRange!Range)
         static struct Result
             private Range source;
             // define empty, front, popFront, etc
         return Result(r);

I'm curious about what declaring the Result struct as 'static' 
does, and if there are use cases where it be better to exclude 
the static qualifier.


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