It's actually "arc upgrade". I added a mention of this command to the wiki:
https://ghc.haskell.org/trac/ghc/wiki/Phabricator#HelpImgettingastrangeerrorwhenrunningarcthatIdidntgetyesterday

Regards,
Reid Barton

On Wed, Aug 5, 2015 at 12:09 PM, Thomas Miedema <thomasmiedema@gmail.com> wrote:
Try running 'arc update' anytime you get such kind of error.

Austin upgrades GHC's Phabricator instance every now and then. Sometimes this requires also an update to `arc` for things to work again.

On Wed, Aug 5, 2015 at 6:02 PM, Simon Peyton Jones <simonpj@microsoft.com> wrote:

Friends

I wanted to build a Phab ticket, so I tried

            arc patch D1069

but it failed, as below. What do I do now?

Thanks

Simon

simonpj@cam-05-unx:~/code/HEAD-5$ arc patch D1069

You have untracked files in this working copy.

 

  Working copy: /home/simonpj/code/HEAD-5/

 

  Untracked files in working copy:

    Foo

    compiler/basicTypes/T7287.stderr

    foo

    libraries/integer-gmp2/GNUmakefile

    libraries/integer-gmp2/ghc.mk

    spj-patch

    testsuite/tests/deriving/should_fail/T2604.hs

    testsuite/tests/deriving/should_fail/T2604.stderr

    testsuite/tests/deriving/should_fail/T5863a.hs

    testsuite/tests/deriving/should_fail/T5863a.stderr

    testsuite/tests/deriving/should_fail/T7800.hs

    testsuite/tests/deriving/should_fail/T7800.stderr

    testsuite/tests/typecheck/should_compile/T9999.hs

    typeable-msg

 

Since you don't have '.gitignore' rules for these files and have not listed

them in '.git/info/exclude', you may have forgotten to 'git add' them to your

commit.

 

 

    Do you want to add these files to the commit? [y/N] N

N

 

Created and checked out branch arcpatch-D1069.

Exception

ERR-CONDUIT-CALL: API Method "differential.query" does not define these parameters: 'arcanistProjects'.

(Run with --trace for a full exception trace.)


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