* doc/lispref/keymaps.texi (Changing Key Bindings): Document
define-keymap and defvar-keymap.
* lisp/subr.el (define-keymap): New function.
(define-keymap--define): New function.
(defvar-keymap): New macro.
* lisp/emacs-lisp/lisp-mode.el (lisp-indent--defvar-keymap): New
function.
(lisp-indent-function): Use it to indent defvar-keymap.
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