http://d.puremagic.com/issues/show_bug.cgi?id=10963

           Summary: filter.save in map changes the behavior of filter
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: ttanjo@gmail.com


--- Comment #0 from Tomoya Tanjo <ttanjo@gmail.com> 2013-09-04 01:14:17 PDT ---
I apologize to use not descriptive summary but I don't know how to explain this behavior...

The following code should work without errors but it doesn't work in dmd
v2.064-devel-6f9a34f and v2.063 on Mac OSX.
It causes AssertError at line 6 at runtime.

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

auto foo(in int[] ar)
{
    assert(ar.length == 1);
    return true;
}

void main(string[] args)
{
    immutable ar = [0];
    [0].map!(_ => {
            auto r = [0].filter!(_ => foo(ar));
            r.save.until!"true";
            return 0;
        }()).front;
}
---

If changing `ar` from immutable to enum, it works.
If using `r.until!"true"` instead of `r.save.until!"true"`, it works.
If using `filter` without `map`, it works.

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