uncommon_branch_prefix_stderr

 = [up to date]      refs/pull/1/head -> pull/1/head
 = [up to date]      refs/pull/1/merge -> pull/1/merge
 = [up to date]      refs/pull/2/head -> pull/2/head
 = [up to date]      refs/pull/2/merge -> pull/2/merge
 = [up to date]      refs/pull/3/head -> pull/3/head
 = [up to date]      refs/pull/3/merge -> pull/3/merge