[Issue 1967] New: getDirName does not seem to use altsep on windows

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=1967

           Summary: getDirName does not seem to use altsep on windows
           Product: D
           Version: 1.028
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: bugzilla at digitalmars.com
        ReportedBy: jason at spashett.com


string filename = `data/models/comet/comet.obj`;
getDirName(filename);

returns "" which I think is incorrect since the "/" path separator is valid for
system calls.

string filename = `data\models\comet\comet.obj`;
getDirName(filename);
returns `data\models\comet` which is correct.


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