Phabricator:arcanist-core-7bda35a16ef0ec66/en

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You're running a command which operates on a range of revisions (usually, from some revision to HEAD) but have not specified the revision that should determine the start of the range.

Previously, arc assumed you meant '$1' when you did not specify a start revision, but this behavior does not make much sense in most workflows outside of Facebook's historic $2 workflow.

arc no longer assumes '$3'. You must specify a relative commit explicitly when you invoke a command (e.g., `$4`, not just `$5`) or select a default for this working copy.

In most cases, the best default is '$6'. You can also select '$7' to preserve the old behavior, or some other remote or branch. But you almost certainly want to select 'origin/master'.

(Technically: the merge-base of the selected revision and HEAD is used to determine the start of the commit range.)