[Issue 17091] std.range.zip cannot "save" correctly

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17091

--- Comment #1 from Kazuki Komatsu <enjouzensyou.boinc at gmail.com> ---
(In reply to Kazuki Komatsu from comment #0)
> Following code cannot be done correctly.
> I tested the following code on DMDv2.072.2.
> The line of the 4th `writeln` should output "[Tuple!(int, int)(1, 4),
> Tuple!(int, int)(2, 5), Tuple!(int, int)(3, 6)]".
> 
> ----
> import std.range;
> import std.algorithm;
> import std.stdio;
> 
> void main()
> {
>     auto s1 = [1, 2, 3].inputRangeObject;
>     auto s2 = [4, 5, 6].inputRangeObject;
>     
>     writeln(s1.save);   // [1, 2, 3], OK
>     writeln(s2.save);   // [1, 2, 3], OK
> 
>     auto added = s1.zip(s2);
>     writeln(zs.save);   // [Tuple!(int, int)(1, 4), Tuple!(int, int)(2, 5),
> Tuple!(int, int)(3, 6)], OK
>     writeln(zs.save);   // [], NG
> }
> ----

Sorry, `auto added = s1.zip(s2);` is wrong.
The correct code is following one

--------
import std.range;
import std.algorithm;
import std.stdio;

void main()
{
    auto s1 = [1, 2, 3].inputRangeObject;
    auto s2 = [4, 5, 6].inputRangeObject;

    writeln(s1.save);   // [1, 2, 3], OK
    writeln(s2.save);   // [1, 2, 3], OK

    auto zs = s1.zip(s2);
    writeln(zs.save);   // [Tuple!(int, int)(1, 4), Tuple!(int, int)(2, 5),
Tuple!(int, int)(3, 6)], OK
    writeln(zs.save);   // [], NG
}
--------

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