I tried
(eval-after-load 'cider
'(progn
(define-key cider-mode-map (kbd "<C-tab>") 'cider-switch-to-repl-buffer)
(define-key cider-repl-mode-map (kbd "<C-tab>") 'cider-switch-to-repl-buffer)))
But it only works in the buffer, i.e. I can switch from the buffer to the repl, but not the other way around. What I'm trying to achieve is to use C-tab to switch back and forth between the buffer and the repl.
Thanks!