Re: [GHC] #8466: Aggregate “ambiguous import” errors for the same name

[GHC]

#8466: Aggregate “ambiguous import” errors for the same name
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        Reporter:  nomeata           |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by nomeata):

 Interesting, the field `errMsgSpans` of `ErrMsg`  already has tpye
 `[SrcSpan]` (and not `SrcSpan`) as if someone was preparing this feature.
 Tracing the git history, I find that the type was introduced in
 29da2cf3011c292bc4261601aff85afb13e24d54 from ten years ago by simonmar,
 but without an explanation of the choice...

 I’ll see if indeed nothing breaks if I change this to `SrcSpan` before
 attempting to combine the error messages.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8466#comment:4>
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