Environment Information

Provide at least:

• JRuby: 10.1.0.0
• OS: Linux

Expected Behavior

MRI 4.0 and JRuby 10.1 return the same number of lines when caller is called.

I know it might fall under "Stack Trace Differences" mentioned in Differences Between MRI and JRuby. If that's expected difference, just let me know.

Between Ruby 3.4 and 4.0 there was a change in what is returned from caller when it's invoked inside initialize.

With this reproduction script (caller.rb):

class Inner
  def initialize
    puts caller
  end
end

class Outer
  def call
    Inner.new
  end
end

Outer.new.call

On Ruby 3.4:

caller.rb:9:in 'Class#new'
caller.rb:9:in 'Outer#call'
caller.rb:13:in '<main>'

On Ruby 4.0:

caller.rb:9:in 'Outer#call'
caller.rb:13:in '<main>'

Actual Behavior

On JRuby 10.1.0.0:

caller.rb:9:in 'new'
caller.rb:9:in 'call'
caller.rb:13:in '<main>'

(same as in 10.0.5.0)

So it's actually the opposite to this part in wiki:

The "new" frame from constructing an object may not be present due to optimizations.

"new" frame is actually present in JRuby, but not in MRI.