[Issue 13964] New: InputRange!T doesn't have save method

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13964

          Issue ID: 13964
           Summary: InputRange!T doesn't have save method
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: DMD
          Assignee: nobody at puremagic.com
          Reporter: luis at luismarques.eu

This fails (due to a lack of a save method?):

```
import std.range;

void main()
{
    InputRange!int range = inputRangeObject([1, 2, 3]);
    auto range2 = range.save();
}
```

/d812/f275.d(6): Error: template std.array.save cannot deduce function from
argument types !()(InputRange!int), candidates are:
/opt/compilers/dmd2/include/std/array.d(429):        std.array.save(T)(T[] a)

(http://dpaste.dzfl.pl/bde562b99c5a)

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