Don't have C-x = bug out in a "C" locale with non-ASCII chars

* lisp/simple.el (what-cursor-position): Ensure that we always
have a coding system here, even if the locale is "C" (bug#40702).

diff --git a/lisp/simple.el b/lisp/simple.el
index 6bc41961eba543be9b10f4059bac9f96bc6294b5..fef22c2fa6f648585992799c1345c97e1d56319c 100644 (file)
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -1533,7 +1533,11 @@ in *Help* buffer.  See also the command `describe-char'."
            encoded encoding-msg display-prop under-display)
        (if (or (not coding)
                (eq (coding-system-type coding) t))
-           (setq coding (default-value 'buffer-file-coding-system)))
+           (setq coding (or (default-value 'buffer-file-coding-system)
+                             ;; A nil value of `buffer-file-coding-system'
+                             ;; means "no conversion" which means each byte
+                             ;; is a char and vice versa.
+                             'binary)))
        (if (eq (char-charset char) 'eight-bit)
            (setq encoding-msg
                  (format "(%d, #o%o, #x%x%s, raw-byte)" char char char char-name-fmt))