[ruby-core:111115] [Ruby master Bug#19003] TracePoint behavior inconsistency in 3.2.0-preview2

Issue #19003 has been updated by ko1 (Koichi Sasada).


Sorry for late.

We left this issue as an implementation details and on Ruby 3.2 the current behavior will be remain. Sorry for inconvenient for your purpose.

The reason is to implement the proposed behavior strictly needs a much work and we can't do that now. In my opinion the proposal behavior is preferable, so it can be fixed in future.

BTW on the debug.gem we avoid duplicated TracePoint manually.

----------------------------------------
Bug #19003: TracePoint behavior inconsistency in 3.2.0-preview2
https://bugs.ruby-lang.org/issues/19003#change-100388

* Author: hurricup (Alexandr Evstigneev)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.2.0preview2 (2022-09-09 master 35cfc9a3bb) [x86_64-linux]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
This is kind of continuation of my previous report about global/local TP processing (#18730).

Sample script:
```rb
def foo
  return 1
end

puts RubyVM::InstructionSequence.of(method :foo).disasm

def step_over
  TracePoint.new(:line, :return, :b_return) do |tp|
    puts "Step over hits by #{tp.event} at #{tp.lineno}"
    step_over
    tp.disable
  end.enable(target: RubyVM::InstructionSequence.of(method :foo), target_thread: Thread.current)
end

TracePoint.new(:line, :return, :b_return) do |tp|
  if tp.lineno == 2
    puts "Step into hits by #{tp.event} at #{tp.lineno}"
    step_over
    tp.disable
  end
end.enable(target_thread: Thread.current)

a = foo
```

In ruby 3.1.2 we have expected behavior. Output:
```
== disasm: #<ISeq:foo@/home/hurricup/Projects/ruby-debugger/jb-debase-30/test_sample.rb:1 (1,0)-(3,3)> (catch: FALSE)
0000 putobject_INT2FIX_1_                                             (   2)[LiCa]
0001 leave                                                            (   3)[Re]
Step into hits by line at 2
Step over hits by return at 3
```

In ruby 3.2.0-preview2 - not so much. Output:
```
== disasm: #<ISeq:foo@/home/hurricup/Projects/ruby-debugger/jb-debase-30/test_sample.rb:1 (1,0)-(3,3)> (catch: false)
0000 putobject_INT2FIX_1_                                             (   2)[LiCa]
0001 leave                                                            (   3)[Re]
Step into hits by line at 2
Step over hits by line at 2
Step over hits by return at 3
```



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