Bug #14479
Updated by ko1 (Koichi Sasada) over 2 years ago
This is a Ruby 2.5 regression. If you raise an exception from a :call tracepoint, it can, in certain circumstances, be caught by a rescue block inside the called method. Here is an illustration: ``` #### def foo begin puts "hi" rescue => e puts "In rescue" end end TracePoint.trace :call do |tp| raise "kaboom" if tp.method_id == :foo end foo ``` #### In Ruby 2.4.3, this results in the exception as expected. In Ruby 2.5.0, this results in "in rescue" being printed to the console. The rescue block inside method "foo" is catching the exception. This is highly dependent on the positioning of the rescue block in the method, and may be related to which bytecode is flagged with the trace flag. For example, the following method "foo" raises the exception in Ruby 2.5.0: ``` #### def foo puts "hi" begin puts "hi" rescue => e puts "In rescue" end end ``` #### Here are three more interesting variants that should be considered: ``` #### def foo if true begin puts "hi" rescue => e puts "In rescue" end end end ``` #### Prints "in rescue" ``` #### def foo if false begin puts "hi" rescue => e puts "In rescue" end end end ``` #### Raises the exception ``` #### def foo if false begin puts "hi" rescue => e puts "In rescue" end end 1 end ``` #### Segfaults! Segfaults!