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Bug #18060

Updated by alanwu (Alan Wu) over 2 years ago

The following program loops indefinitely: 

 ```ruby 
 puts("PID: #{$$}") 

 # Warning: prints in an infinite loop 
 class Foo 
   define_singleton_method(:foo) { return } 
 end 

 counter = 0 
 TracePoint.trace(:b_return) do |tp| 
   $stdout.write(counter, ' ', tp.inspect, "\r") 
   counter += 1 p tp 
   raise 
 end 

 Foo.foo 
 ``` 

 It doesn't seem intentional that this loops. 

 Fix: https://github.com/ruby/ruby/pull/4638

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