Question

I wrote the function

(defun test ()   (let ((str1 'foo') (str2 'bar'))     (loop for s in '(str1 str2) do (message s)))) 

but it does not work. The Elisp Backtrace message is:

Debugger entered–Lisp error: (wrong-type-argument stringp str1)

How can I make it work?

P.S.: the following modified version works perfectly, but I need the original version

(defun test1 ()   (loop for s in '('asdf' 'fdsa') do (message s))) 

Answer 1

The quote operator (for which the apostrophe is syntactic sugar) means that its arguments are not evaluated, i.e. (quote (str1 str2)) returns a list of two symbols. Use list instead: (list str1 str2).