Use help.c:help_unknown_ref instead of die to provide a friendlier error
message before exiting, when one of the refs specified in a merge is unknown.

Signed-off-by: Vikrant Varma <vikrant.varm...@gmail.com>
---
 builtin/merge.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/builtin/merge.c b/builtin/merge.c
index 3e2daa3..2ebe732 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1054,7 +1054,8 @@ static struct commit_list *collect_parents(struct commit 
*head_commit,
        for (i = 0; i < argc; i++) {
                struct commit *commit = get_merge_parent(argv[i]);
                if (!commit)
-                       die(_("%s - not something we can merge"), argv[i]);
+                       help_unknown_ref(argv[i], "merge",
+                                        "not something we can merge");
                remotes = &commit_list_insert(commit, remotes)->next;
        }
        *remotes = NULL;
-- 
1.7.10.4

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