     (define-key m "=" 'go-mode-insert-and-indent)
     (define-key m (kbd "C-c C-a") 'go-import-add)
     (define-key m (kbd "C-c C-j") 'godef-jump)
+    (define-key m (kbd "C-x 4 C-c C-j") 'godef-jump-other-window)
     (define-key m (kbd "C-c C-d") 'godef-describe)
     m)
   "Keymap used by Go mode to implement electric keys.")

    (let ((filename (match-string 1 specifier))
          (line (string-to-number (match-string 2 specifier)))
          (column (string-to-number (match-string 3 specifier))))
      (with-current-buffer (find-file filename)
        (goto-char (point-min))
        (forward-line (1- line))
        (beginning-of-line)

        (message "Removed %d imports" (length lines)))
      (if flymake-state (flymake-mode-on)))))

(defun godef--find-file-line-column (specifier other-window)
  "Given a file name in the format of `filename:line:column',
visit FILENAME and go to line LINE and column COLUMN."
  (if (not (string-match "\\(.+\\):\\([0-9]+\\):\\([0-9]+\\)" specifier))
