Bug #21819: A Data object should be frozen even if it has no members

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 4.0.0 (2025-12-25 revision 553f1675f3) +PRISM [arm64-darwin25]
• Backport: 3.2: REQUIRED, 3.3: REQUIRED, 3.4: DONE, 4.0: DONE

[dazuma (Daniel Azuma)]

Data objects with at least one member are currently automatically frozen on construction, and shareable if all members are shareable. However, a Data object with no members is not frozen on construction. I would expect such an object similarly to be frozen (and also shareable since it has no non-shareable members).

Foo = Data.define(:foo)
Foo.new(1).frozen? # => true

Bar = Data.define
Bar.new.frozen? # => false

[nobu (Nobuyoshi Nakada)]

• Backport changed from 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN to 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED, 4.0: REQUIRED

[nobu (Nobuyoshi Nakada)]

GH-15792

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset git|d7a6ff8224519005d2deeb3f4e98689a8a0835ad.

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[Bug #21819] Data objects without members should also be frozen

[k0kubun (Takashi Kokubun)]

• Backport changed from 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED, 4.0: REQUIRED to 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED, 4.0: DONE

ruby_4_0 6273c59a6e1f8587e549d5a5f44fd9363e6eb018 merged revision(s) d7a6ff8224519005d2deeb3f4e98689a8a0835ad.

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED, 4.0: DONE to 3.2: REQUIRED, 3.3: REQUIRED, 3.4: DONE, 4.0: DONE

ruby_3_4 d5ca99a71ccb170db08e4b610d661ce3a18626f2 merged revision(s) d7a6ff8224519005d2deeb3f4e98689a8a0835ad.