merge_trees(): ensure that the callers release output buffer

diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index ac9c76479933f6f1c750aa4a6f544a8b5a343439..8a833f354e331966f5f927ae94ac8686dd6d166f 100755 (executable)
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -79,6 +79,15 @@ test_expect_success 'git branch -m dumps usage' '
        test_i18ngrep "branch name required" err
 '
 
+test_expect_success 'git branch -m m broken_symref should work' '
+       test_when_finished "git branch -D broken_symref" &&
+       git branch -l m &&
+       git symbolic-ref refs/heads/broken_symref refs/heads/i_am_broken &&
+       git branch -m m broken_symref &&
+       git reflog exists refs/heads/broken_symref &&
+       test_must_fail git reflog exists refs/heads/i_am_broken
+'
+
 test_expect_success 'git branch -m m m/m should work' '
        git branch -l m &&
        git branch -m m m/m &&