On 03.08.2022 11:12, Damien Mattei wrote: > GNU Guile 3.0.1 > Copyright (C) 1995-2020 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)> (define str2 "hello") > scheme@(guile-user)> (string-set! str2 4 #\a) > ice-9/boot-9.scm:1669:16: In procedure raise-exception: > string is read-only: "hello" > > Entering a new prompt. Type `,bt' for a backtrace or `,q' to continue. > scheme@(guile-user) [1]> ,q > scheme@(guile-user)> (string? str2) > #t > > is it a bug in Guile ? :-O > > i can only find reference to deprecated read-only string in old doc: > https://www.gnu.org/software/guile/docs/docs-1.6/guile-ref/Read-Only-Strings.html#Read%20Only%20Strings > > <https://www.gnu.org/software/guile/docs/docs-1.6/guile-ref/Read-Only-Strings.html#Read%20Only%20Strings> > > Regards, > > Damien
String literals are constants, and it's intentional. I'm not sure if it's mentioned anywhere in the manual. If you want to get a mutable string from a literal, you can use: (define str (string-copy "foobar")) -- Taylan
