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local string variables and String.set #2579

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vicuna opened this issue Oct 3, 2000 · 1 comment
Closed

local string variables and String.set #2579

vicuna opened this issue Oct 3, 2000 · 1 comment
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@vicuna
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vicuna commented Oct 3, 2000

Original bug ID: 197
Reporter: administrator
Status: closed
Resolution: fixed
Priority: normal
Severity: feature
Category: ~DO NOT USE (was: OCaml general)

Bug description

Full_Name: Claude Marche
Version: 3.00
OS: Linux
Submission from: pc801.lri.fr (129.175.8.109)

C'est clairement mis en evidence par le test ci-dessous. Le bug a lieu avec
ocamlc pas ocamlopt

pc801:~> cat bug.ml

let f () =
let s = "+" in
Format.print_string (if s = "+" then "ok\n" else "bug\n");
String.set s 0 '-'
;;
f ();;
f ();;
pc801:> ocamlc -o bug bug.ml
pc801:> ./bug
ok
bug
pc801:> ocamlopt -o bug bug.ml
pc801:> ./bug
ok
ok
pc801:~>
@vicuna
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vicuna commented Apr 2, 2001

Comment author: administrator

Literal strings are mutable in OCaml and we can't reasonably change this
behavior. For ocamlopt, the test "works" because the two "+" literal strings
are re-shared by the code generator! This questionable behavior removed
2001-04-02 by XL because it caused other problems.

@vicuna vicuna closed this as completed Jun 25, 2001
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