From: "andhapp (Anuj Dutta)" <anuj@...>
Date: 2014-01-03T21:04:21+09:00
Subject: [ruby-core:59521] [ruby-trunk - Bug #9358][Open] TracePoint's raise	event should throw 'not supported by this event	(RuntimeError)' on calling return_value


Issue #9358 has been reported by andhapp (Anuj Dutta).

----------------------------------------
Bug #9358: TracePoint's raise event should throw 'not supported by this event (RuntimeError)' on calling return_value
https://bugs.ruby-lang.org/issues/9358

Author: andhapp (Anuj Dutta)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: 2.1.0
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN, 2.1: UNKNOWN


=begin
Hello,

In TracePoint class, if a particular introspection method is not supported then 'not supported by this event (RuntimeError)' is thrown. 

=== Line event doesn't support raised_exception

     TracePoint.trace(:line) do |tp|
       p tp.raised_exception
     end

     #=> RuntimeError: 'raised_exception' not supported by this event


However, that doesn't seem to happen for 'raise' event. The call to return_value stops the trace altogether. Here's the code to reproduce it:

=== Code 

  class Car
    def self.start
      begin
        raise StandardError.new, 'Error!'
      rescue 
      end
    end
  end

  TracePoint.trace(:raise) do |tp|
    p tp.raised_exception
    p [tp.return_value, tp.raised_exception]
  end

  Car.start

=== Expected Output
  #=> #<StandardError: Error!>
  #=> `return_value': not supported by this event (RuntimeError)

=== Actual Output
  #=> #<StandardError: Error!>

Is this expected behaviour? 

Thanks



=end



-- 
http://bugs.ruby-lang.org/