On Mon 11 Apr 2011, David Kastrup wrote:
Type M-z M-z and you get the following error back trace and message:
Debugger entered--Lisp error: (wrong-type-argument characterp 134217850)
call-interactively(zap-to-char nil nil)
`zap-to-char' (in simple.el) has interactive spec:
(interactive "p\ncZap to char: ")
Looking at `call-interactively' (in callint.c):
--8<---------------cut here---------------start------------->8---
case 'c': /* Character */
/* Prompt in `minibuffer-prompt' face. */
Fput_text_property (make_number (0),
make_number (SCHARS (callint_message)),
Qface, Qminibuffer_prompt, callint_message);
args[i] = Fread_char (callint_message, Qnil, Qnil);
message1_nolog ((char *) 0);
/* Passing args[i] directly stimulates compiler bug */
teml = args[i];
visargs[i] = Fchar_to_string (teml);
break;
--8<---------------cut here---------------end--------------->8---
Looking at the help for `read-char':
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If the user generates an event which is not a character (i.e. a mouse
click or function key event), `read-char' signals an error. As an
exception, switch-frame events are put off until non-character events
can be read.
If you want to read non-character events, or ignore them, call
`read-event' or `read-char-exclusive' instead.
--8<---------------cut here---------------end--------------->8---