Avoid "control-control-KEY" (bug#55738)

Constructs such as ?\C-^@ or ?\C-\C-m literally apply a Control
modifier twice which doesn't make sense at all.  What is really meant
is a C0 base character with the Control modifier bit set.
This change is only stylistic in nature.

* lisp/edmacro.el (edmacro-format-keys):
* lisp/keymap.el (key-parse):
* lisp/subr.el (event-modifiers, event-basic-type):
* test/lisp/subr-tests.el (subr-test-kbd):
Use \0 and \r instead of ^@ and \C-m to represent NUL and RET
when combined with other modifiers.

1 files changed, 1 insertions, 1 deletions

diff --git a/test/lisp/subr-tests.el b/test/lisp/subr-tests.el
index a25eb363b01..45dd2d71603 100644
--- a/test/lisp/subr-tests.el
+++ b/test/lisp/subr-tests.el
@@ -112,7 +112,7 @@
   (should (equal (kbd "C-x C-f") "\C-x\C-f"))
   (should (equal (kbd "C-M-<down>") [C-M-down]))
   (should (equal (kbd "<C-M-down>") [C-M-down]))
-  (should (equal (kbd "C-RET") [?\C-\C-m]))
+  (should (equal (kbd "C-RET") [?\C-\r]))
   (should (equal (kbd "C-SPC") [?\C- ]))
   (should (equal (kbd "C-TAB") [?\C-\t]))
   (should (equal (kbd "C-<down>") [C-down]))