Please don’t break travis

[Joachim Breitner]

Hi,

again, Travis is failing to build master since a while. Unfortunately,
only the author of commits get mailed by Travis, so I did not notice it
so far. But usually, when Travis reports a build failure, this is
something actionable! If in doubt, contact me.

The breakage at the moment occurs only with -DDEBUG on:

    Compile failed (exit code 1) errors were:
    ghc-stage2: panic! (the 'impossible' happened)
      (GHC version 8.1.20161118 for x86_64-unknown-linux):
    	    No match in record selector is_iloc

    Please report this as a GHC bug:      http://www.haskell.org/ghc/reportabug


*** unexpected failure for rn017(normal)
Compile failed (exit code 1) errors were:
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 8.1.20161118 for x86_64-unknown-linux):
	No match in record selector is_iloc

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug


*** unexpected failure for T7672(normal)

And started appearing, unless I am mistaken, with

    From: Matthew Pickering <    matthewtpickering at gmail.com    >
    Date: Fri, 18 Nov 2016 16:28:30 +0000
    Subject: [PATCH] Optimise whole module exports

    We directly build up the correct AvailInfos rather than generating
    lots of singleton instances and combining them with expensive calls to
    unionLists.

    There are two other small changes.

    * Pushed the nubAvails call into the explicit export list
      branch as we construct them correctly and uniquely ourselves.
    * fix_faminst only needs to check the first element of the export
      list as we maintain the (yucky) invariant that the parent is the
      first thing in it.

    Reviewers: simonpj, austin, bgamari

    Reviewed By: simonpj, bgamari

    Subscribers: simonpj, thomie, niteria

    Differential Revision:     https://phabricator.haskell.org/D2657

Matthew, can you verify that this is a regression introduce here?

Greetings,
Joachim

-- 
Joachim “nomeata” Breitner
  mail at joachim-breitner.de • https://www.joachim-breitner.de/
  XMPP: nomeata at joachim-breitner.de • OpenPGP-Key: 0xF0FBF51F
  Debian Developer: nomeata at debian.org
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