Format error in Steel Bank Common Lisp in Slime Mode

Question

If I run this code

(format t "~a" "hello world")

in sbcl's default REPL, the output is "hello world" as expected. However, when I try to run the same code in slime mode in emacs, it throws the following error:

eval: Wrong type argument: stringp, t

What is that i am doing wrong here ?

Answer 1

This is an Emacs error message, not an SBCL's one.

You are giving the form to Emacs and in Emacs Lisp the function format does not take a stream designator as the first argument:

format is a built-in function in `editfns.c'.

(format STRING &rest OBJECTS)

Format a string out of a format-string and arguments. The first argument is a format control string. The other arguments are substituted into it to make the result, a string.