[Issue 204] New: Improve error message.

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=204

           Summary: Improve error message.
           Product: D
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla at digitalmars.com
        ReportedBy: dawid.ciezarkiewicz at gmail.com


map.d(165): cannot create instance of abstract class Droid

Please add info about method which isn't implemented yet: "because XXX is
abstract" or smth. If many - the first one is good enought.


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