[ruby-core:93705] [Ruby master Bug#9358] TracePoint's raise event should throw 'not supported by this event (RuntimeError)' on calling return_value

Issue #9358 has been updated by jeremyevans0 (Jeremy Evans).

Backport deleted (1.9.3: UNKNOWN, 2.0.0: UNKNOWN, 2.1: UNKNOWN)
Status changed from Open to Closed

This is expected behavior.  As the documentation states:

`raised_exception`: `Value from exception raised on the :raise event`
`return_value`: `Return value from :return, c_return, and b_return event`

You cannot call methods not supported by the type.  You can use the `event` method to check the type of the particular event.

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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#change-79329

* Author: andhapp (Anuj Dutta)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.1.0
* Backport: 
----------------------------------------
=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




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