[GHC] #10533: Assertion failure on FD3 test in TcErrors

[GHC]

#10533: Assertion failure on FD3 test in TcErrors
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                   Owner:
            Type:  bug               |                  Status:  closed
        Priority:  normal            |               Milestone:
       Component:  Compiler (Type    |                 Version:  7.11
  checker)                           |                Keywords:
      Resolution:  fixed             |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by simonpj):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 I looked at this and fixed it, but failed to make a separate patch. I
 think it is somewhere in
 {{{
 commit 02bac0254182def11029e2f7373ba8d2ba9ebe44
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Thu Jun 18 14:12:54 2015 +0100

     Remove some horrible munging of origins for Coercible

     I just didn't think it was buying enough for all the cruft it caused.
     We can put some back if people start complaining about poor error
     messages. I forget quite how I tripped over this but I got sucked in.

     * Lots of tidying up in TcErrors

     * Rename pprArisingAt to pprCtLoc, by analogy with pprCtOrigin

     * Remove CoercibleOrigin data constructor from CtOrigin

     * Make relevantBindings return a Ct with a zonked
       and tidied CtOrigin

     * Add to TcRnTypes
           ctOrigin   :: Ct -> CtOrigin
           ctEvOrigin :: CtEvidence -> CtOrigin
           setCtLoc   :: Ct -> CtLoc -> Ct
 }}}
 But in any case it doesn't matter much.  No need to merge etc.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10533#comment:8>
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