[Issue 4861] New: Zip-sorting broken

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4861

           Summary: Zip-sorting broken
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: regression
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: dsimcha at yahoo.com


--- Comment #0 from David Simcha <dsimcha at yahoo.com> 2010-09-13 10:05:33 PDT ---
Latest SVN release of Phobos (1993), DMD 2.048, must be run w/ asserts enabled:

import std.algorithm, std.range;

void main() {
    auto a = [5,4,3,2,1];
    auto b = [3,1,2,5,6];
    auto z = zip(a, b);

    sort!"a.field[0] < b.field[0]"(z);
}

core.exception.AssertError at d:\dmd2\windows\bin\..\..\src\phobos\std\algorithm.d(5187):
Zip!(int[],int[]): [Tuple!(int,int)(4, 1) Tuple!(int,int)(5, 3)
Tuple!(int,int)(3, 2) Tuple!(int,int)(1, 6) Tuple!(int,int)(2, 5)]

For some reason the zip-sorting case used in the Zip unittest seems to miss
this bug, but it occurs on almost all real-world inputs.

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