arc diff problems

Edward Z. Yang ezyang at
Wed Aug 5 18:06:59 UTC 2015

Hello friends,

I too am having Arcanist problems (my libphutil and arcanist
are at the latest head).  Here's my error:

[ezyang at hs01 ghc-quick]$ arc diff HEAD~
You have untracked files in this working copy.

  Working copy: /home/hs01/ezyang/ghc-quick/

  Untracked changes in working copy:
  (To ignore these changes, add them to ".git/info/exclude".)

    Ignore these untracked files and continue? [y/N] y

Field "testPlan" occurs twice in commit message!
(Run with `--trace` for a full exception trace.)

Here is the commit message in question:

commit 80ef08619c315e35e439e50724afc5d3b3203895
Author: Edward Z. Yang <ezyang at>
Date:   Fri Jul 24 15:13:49 2015 -0700

    Unify hsig and hs-boot; add preliminary "hs-boot" merging.
    This patch drops the file level distinction between hs-boot and hsig;
    we figure out which one we are compiling based on whether or not there
    is a corresponding hs file lying around.
    To make the "import A" syntax continue to work for bare hs-boot
    files, we also introduce hs-boot merging, which takes an A.hi-boot
    and converts it to an A.hi when there is no A.hs file in scope.
    This will be generalized in Backpack to merge multiple A.hi files together;
    which means we can jettison the "load multiple interface files" functionality.
    This works automatically for --make, but for one-shot compilation
    we need a new mode: ghc --merge-requirements A will generate an A.hi/A.o
    from a local A.hi-boot file; Backpack will extend this mechanism further.
    Has Haddock submodule update to deal with change in msHsFilePath behavior.
        - This commit drops support for the hsig extension. Can
          we support it?  It's annoying because the finder code is
          written with the assumption that where there's an hs-boot
          file, there's always an hs file too.  To support hsig, you'd
          have to probe two locations.  Easier to just not support it.
        - #10333 affects us, modifying an hs-boot still doesn't trigger
        - See compiler/main/Finder.hs: this diff is very skeevy, but
          it seems to work.
        - This code cunningly doesn't drop hs-boot files from the
          "drop hs-boot files" module graph, if they don't have a
          corresponding hs file.  I have no idea if this actually is useful.
    Signed-off-by: Edward Z. Yang <ezyang at>
    Test Plan: validate
    Reviewers: simonpj, austin, bgamari, spinda
    Subscribers: thomie
    Differential Revision:

It doesn't work even if I delete "Test Plan".


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