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Re: string is read-only

From: Jean Abou Samra
Subject: Re: string is read-only
Date: Wed, 3 Aug 2022 11:50:37 +0200

Le 3 août 2022 à 11:49, Taylan Kammer <> a écrit :

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)

is it a bug in Guile ? :-O

i can only find reference to deprecated read-only string in old doc: <>



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"))


This is standard. See the intro of

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