arc diff problems

Edward Z. Yang ezyang at
Wed Aug 5 19:53:47 UTC 2015

OK, I've resolved the problem; the problem was that I had
copypasted an updated commit message into the Phabricator
description field which contained special fields, which caused
problems for Phabricator.


Excerpts from Edward Z. Yang's message of 2015-08-05 11:06:59 -0700:
> 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".)
>     testsuite/tests/driver/T9938
>     testsuite/tests/driver/T9938B
>     testsuite/tests/driver/dynamicToo/dynamicToo001/d
>     testsuite/tests/driver/dynamicToo/dynamicToo001/s
>     testsuite/tests/driver/dynamicToo/dynamicToo005/A005.dyn_o-boot
>     Ignore these untracked files and continue? [y/N] y
> Exception
> 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
>           recomp.
>         - 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".
> Edward

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