Bug #9358
closedTracePoint's raise event should throw 'not supported by this event (RuntimeError)' on calling return_value
Description
=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
Updated by jeremyevans0 (Jeremy Evans) over 5 years ago
- Status changed from Open to Closed
- Backport deleted (
1.9.3: UNKNOWN, 2.0.0: UNKNOWN, 2.1: UNKNOWN)
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.