[ruby-core:107974] [Ruby master Bug#18646] Inconsistent behavior for the targeted TracePoints in ruby 2.6-2.7 and 3+

Issue #18646 has been updated by Eregon (Benoit Daloze).

Status changed from Open to Closed

I've set the backport field for https://bugs.ruby-lang.org/issues/17302.
For 2.6 it's unlikely given it's soon EOL.
In any it's up to branch maintainers.

I'll close this since everything is tracked by the backport field now.

----------------------------------------
Bug #18646: Inconsistent behavior for the targeted TracePoints in ruby 2.6-2.7 and 3+
https://bugs.ruby-lang.org/issues/18646#change-96924

* Author: hurricup (Alexandr Evstigneev)
* Status: Closed
* Priority: Normal
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Ruby 2.6 introduced the API for targeted tracepoints.
But for some reason, before ruby 3.0, tracepoints looks exclusive per iseq. 

Consider an example:
```
def somemethod
  puts 1
  puts 2
  puts 3
end

tp1 = TracePoint.new(:line) { |tp| puts 'This is tp1'}
tp2 = TracePoint.new(:line) { |tp| puts 'This is tp2'}

method_iseq = RubyVM::InstructionSequence.of(method :somemethod)
tp1.enable(target: method_iseq, target_line: 2)
tp2.enable(target: method_iseq, target_line: 4)
somemethod

```

Ruby 2.6-2.7 prints :
```
1
2
This is tp2
3
```
And this is unexpected, because we have 2 tracepoints and expecting both to work. But actually, only last enabled does.

Ruby 3+ work as expected:
```
This is tp1
1
2
This is tp2
3
```
Would be really nice to have consistent 3+ behavior everywhere



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