Bug #9358

TracePoint's raise event should throw 'not supported by this event (RuntimeError)' on calling return_value

Added by Anuj Dutta 3 months ago.

[ruby-core:59521]
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

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.raisedexception
p [tp.return
value, tp.raised_exception]
end

Car.start

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

=== Actual Output
#=> #

Is this expected behaviour?

Thanks

=end

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