Merge branch 'maint'

* maint:
  More friendly message when locking the index fails.
  Document git blame --reverse.
  Documentation: Note file formats send-email accepts

1 files changed, 1 insertions, 0 deletions

diff --git a/cache.h b/cache.h
index 21bbf9b11..21a63103d 100644
--- a/cache.h
+++ b/cache.h
@@ -484,6 +484,7 @@ struct lock_file {
 };
 #define LOCK_DIE_ON_ERROR 1
 #define LOCK_NODEREF 2
+extern NORETURN void unable_to_lock_index_die(const char *path, int err);
 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 extern int hold_lock_file_for_append(struct lock_file *, const char *path, int);
 extern int commit_lock_file(struct lock_file *);