Feature #20390: Issue with StringIO and chilled strings

• Status: Closed
• Assignee: byroot (Jean Boussier)
• Target version: -

[mdalessio (Mike Dalessio)]

StringIO doesn't appear to handle chilled strings in a backwards-compatible way after 12be40ae

require "stringio"

sio = StringIO.new("")
sio.write("hello")

When not specifying a value for frozen-string-literal, the empty string is chilled so I would expect to get a warning but also expect the write to complete.

Instead, the write fails as if the string is frozen:

ruby 3.4.0dev (2024-03-23T16:40:17Z master 8265a7531f) [x86_64-linux]
./issue-stringio-frozen.rb:8:in 'StringIO#write': not opened for writing (IOError)
        from ./issue-stringio-frozen.rb:8:in '<main>'

cc @byroot (Jean Boussier) @etienne (Étienne Barrié)

[byroot (Jean Boussier)]

This is being discussed at https://github.com/ruby/stringio/pull/93

[byroot (Jean Boussier)]

• Assignee set to byroot (Jean Boussier)
• Backport changed from 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN to 3.0: DONTNEED, 3.1: DONTNEED, 3.2: DONTNEED, 3.3: DONTNEED

[nobu (Nobuyoshi Nakada)]

• Tracker changed from Bug to Feature
• ruby -v deleted (ruby 3.4.0dev (2024-03-23T16:40:17Z master 8265a7531f) [x86_64-linux])
• Backport deleted (3.0: DONTNEED, 3.1: DONTNEED, 3.2: DONTNEED, 3.3: DONTNEED)

[etienne (Étienne Barrié)]

• Status changed from Open to Closed

Applied in changeset git|0f5ab4ad5289d6385b74e800a73de005a48737b6.

---

[ruby/stringio] Eagerly defrost chilled strings

[Feature #20390]

https://github.com/ruby/stringio/commit/17ee957f34

Co-authored-by: Jean Boussier [e-mail]

[byroot (Jean Boussier)]

• Related to Feature #20205: Enable `frozen_string_literal` by default added