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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit I run (define capitals '(("New York" . "Albany") ("Oregon" . "Salem") ("Florida" . "Miami"))) followed by (set! capitals (assoc-set! capitals "Florida" "Tallahassee")) and get "ice-9/boot-9.scm:1676:22: In procedure raise-exception: In procedure set-cdr!: Wrong type argument in position 1 (expecting mutable pair): ("Florida" . "Miami") Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue." (In geiser in emacs on Arch) Warning: In my own code it actually worked on and off. Work-around: Use (define capitals (list (cons "New York" "Albany") (cons "Oregon" . "Salem") (cons "Florida" . "Miami"))) apparently quoted lists are not mutable! --------------2CDL9AlrzsKUBJdy0vS0DZhv Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

I run 

(define capitals '(("New York" . "Albany")
                   ("Oregon"   . "Salem")
                   ("Florida"  . "Miami")))

followed by 

(set! capitals
      (assoc-set! capitals "Florida" "Tallahassee"))

and get

"ice-9/boot-9.scm:1676:22: In procedure raise-exception:
In procedure set-cdr!: Wrong type argument in position 1 (expecting mutable pair): ("Florida" . "Miami")

Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue."


(In geiser in emacs on Arch)

Warning: In my own code it actually worked on and off.

Work-around: Use 

(define capitals (list (cons "New York"  "Albany")
                       (cons "Oregon"   . "Salem")
                       (cons "Florida"  . "Miami")))

apparently quoted lists are not mutable!

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