http://d.puremagic.com/issues/show_bug.cgi?id=3129

           Summary: Cannot take advantage of overriding Throwable.toString
           Product: D
           Version: 2.030
          Platform: x86
               URL: http://www.dsource.org/projects/druntime/browser/trunk
                    /src/compiler/dmd/dmain2.d
        OS/Version: Windows
            Status: NEW
          Keywords: patch
          Severity: normal
          Priority: P2
         Component: druntime
        AssignedTo: s...@invisibleduck.org
        ReportedBy: ma...@pochta.ru


It's a pain when you set Throwable.file, toString function is completely
bypassed by catching block in tryExec, so you can't do posponed error message
generation. AFAIK, only Error takes advantage of setting file field, so it
makes sense to restrict default error output to instances of Error class. No
need to worry about losing this functionality since equivalent code is already
in Throwable.toString.

dmain2.d, line 324
---
- if (e.file)
+ if (e.file && cast(Error)e)
---

Another minor issue is that both Throwable.toString and tryExec iterate through
nested exceptions and output trace contexts, so if file field is not set, both
of them are executed resulting into duplication of exception info.

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