$ guile GNU Guile 2.2.6 Copyright (C) 1995-2019 Free Software Foundation, Inc. Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'. This program is free software, and you are welcome to redistribute it under certain conditions; type `,show c' for details. Enter `,help' for help. scheme@(guile-user)> (use-modules (srfi srfi-9)) scheme@(guile-user)> (define-record-type
(address street city country) address? (street address-street) (city address-city) (country address-country)) scheme@(guile-user)> (define-immutable-record-type (person age email address) person? (age person-age set-person-age) (email person-email set-person-email) (address person-address set-person-address)) While compiling expression: Syntax error: unknown file:13:7: address: Wrong number of arguments in form (address person-address set-person-address) scheme@(guile-user)> (define fsf-address (address "Franklin Street" "Boston" "USA")) scheme@(guile-user)> (set-fields fsf-address ((address-city) "Detroit")) While compiling expression: Syntax error: unknown file:16:24: address-city: Wrong number of arguments in form (address-city) scheme@(guile-user)>