https://issues.dlang.org/show_bug.cgi?id=23330

          Issue ID: 23330
           Summary: std.experimental.logger: file logger uses OS-specific
                    path separators
           Product: D
           Version: D2
          Hardware: All
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: andrej.mitrovich@gmail.com

https://github.com/dlang/phobos/blob/e7cb981fa40bd77647da3dd708c7433724c6ab30/std/logger/filelogger.d#L129

This should use the OS-specific path separator, as on Windows it doesn't strip the path correctly due to using `/`.

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