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-rw-r--r--.arcconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/.arcconfig b/.arcconfig
index c886789d35..29021b3108 100644
--- a/.arcconfig
+++ b/.arcconfig
@@ -2,6 +2,7 @@
"project.name" : "ghc",
"repository.callsign" : "GHC",
"phabricator.uri" : "https://phabricator.haskell.org",
+ "base" : "git:merge-base(origin/master), arc:prompt",
"load": [
".arc-linters/arcanist-external-json-linter"