Function: external-debugging-output
external-debugging-output is a function defined in print.c.
Signature
(external-debugging-output CHARACTER)
Documentation
Write CHARACTER to stderr.
You can call print while debugging emacs, and pass it this function
to make it write to the debugging output.
Source Code
// Defined in /usr/src/emacs/src/print.c
{
CHECK_FIXNUM (character);
printchar_to_stream (XFIXNUM (character), stderr);
return character;
}