Re: Can't recreate a range?

[Paul Backus via Digitalmars-d-learn]

On Thursday, 30 April 2020 at 13:04:47 UTC, Casey wrote:
Here's a minimal code example that duplicates the issue:
import std.array, std.range, std.stdio, std.traits, std.string;

auto readStream(Range)(auto ref Range r) if 
(isInputRange!(Unqual!Range))
{
        struct StreamRange(Range)
        {
                alias R = Unqual!Range;
                R _input;

                auto buff = appender!string;

Using a default value like this means that it will be shared 
among all instances of the struct. Instead, you should set `buff 
= appender!string` in the constructor, so that each struct will 
have its own appender.