[ruby-core:124730] [Ruby Feature#21272] Class.new doesn't trigger :class TracePoint

9 Feb 2026

      Issue #21272 has been updated by Eregon (Benoit Daloze).

cfis (Charlie Savage) wrote in #note-6:
...
Should I move my questions to those tickets?
Yes, or file a new ticket with a reproduction.

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Feature #21272: Class.new doesn't trigger :class TracePoint
https://bugs.ruby-lang.org/issues/21272#change-116332

* Author: st0012 (Stan Lo)
* Status: Open
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According to the official [documentation](https://docs.ruby-lang.org/en/master/TracePoint.html#class-TracePoint-label-...):
...
To filter what is traced, you can pass any of the following as events:
:class
Start a class or module definition.
I'd expect `:class` events to be triggered when new classes are defined via `Class.new` as well, but currently that's not the case.

Should we either support `Class.new`, or clarify the behaviour in documentation?

### Reproduction

```rb
TracePoint.trace(:class) do |tp|
  puts "Class created at line: #{tp.lineno}"
end

class Foo; end # Triggers the tracepoint

Baz = Class.new # Doesn't trigger the tracepoint

# ruby test.rb
# Class created at line: 5
```

-- 
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