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Emit an informative error when failed to hold lock of HEAD. 2233066e (refs: add a new function set_worktree_head_symref, 2016-03-27) added set_worktree_head_symref(), but this is missing a call to unable_to_lock_message() after hold_lock_file_for_update() fails, so it emits an empty error message: % git branch -m oldname newname error: error: HEAD of working tree /path/to/wt is not updated fatal: Branch renamed to newname, but HEAD is not updated! Thanks to Eric Sunshine for pointing this out. Signed-off-by: Kazuki Yamaguchi <k@rhe.jp> Signed-off-by: Junio C Hamano <gitster@pobox.com>