[Issue 7125] New: semi stable sort is not supported

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http://d.puremagic.com/issues/show_bug.cgi?id=7125

           Summary: semi stable sort is not supported
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: k.hara.pg at gmail.com


--- Comment #0 from Kenji Hara <k.hara.pg at gmail.com> 2011-12-17 05:33:37 PST ---
Following code does not compile, 

import std.algorithm;
void main()
{
    auto r1 = sort!("a<b", SwapStrategy.unstable)([1,3,2,4]);
    assert(equal(r1, [1,2,3,4]));

    auto r2 = sort!("a<b", SwapStrategy.semistable)([1,3,2,4]);  // Line 7
    assert(equal(r2, [1,2,3,4]));

    auto r3 = sort!("a<b", SwapStrategy.stable)([1,3,2,4]);
    assert(equal(r3, [1,2,3,4]));
}

Output:
C:\dmd2\src\phobos\std\algorithm.d(7001): Error: static assert 
(cast(SwapStrategy)1 != cast(SwapStrategy)1) is false
C:\dmd2\src\phobos\std\algorithm.d(6710):        instantiated from here:
sortImpl!(result,ss,int[])
test.d(7):        instantiated from here:
sort!("a<b",cast(SwapStrategy)1,int[])

Semi-stable sort is stable sort.
So if stable sort is supported, we can implement it with stable sort, at least.

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