# \[Ruby 1.9 - Bug #164\] (Open) set\_trace\_func no longer reports 'line', 'call' and 'return' events

**URL:** <https://www.ruby-forum.com/t/ruby-1-9-bug-164-open-set-trace-func-no-longer-reports-line-call-and-return-events/140549>\
**Category:** Development\
**Created:** [June 16, 2008, 5:13am UTC](https://www.ruby-forum.com/t/ruby-1-9-bug-164-open-set-trace-func-no-longer-reports-line-call-and-return-events/140549 "2008-06-16T05:13:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dirtytree](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/aeb1de/32.png) [@dirtytree](https://www.ruby-forum.com/u/dirtytree)\
**Post date:** [June 16, 2008, 5:13am UTC](https://www.ruby-forum.com/t/ruby-1-9-bug-164-open-set-trace-func-no-longer-reports-line-call-and-return-events/140549/1 "2008-06-16T05:13:40Z")

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e$B%A%1%C%He(B #164 e$B$,Js9p$5$l$^$7$?!#e(B (by Dave T.)

* * *

Bug #164: set\_trace\_func no longer reports ‘line’, ‘call’ and ‘return’  
events  
[http://redmine.ruby-lang.org/issues/show/164](http://redmine.ruby-lang.org/issues/show/164)

e$B5/I\<\<Te(B: Dave T.  
e$B%9%F!\<%?%9e(B: Open  
e$BM%@hEYe(B: Normal  
e$BC4Ev\<Te(B:  
e$B%+%F%4%je(B:  
Target version:

Given the following code:

class Test  
def test  
a = 1  
b = 2  
end  
end

set\_trace\_func proc {|event, file, line, id, binding, classname|  
printf “%8s %s:%-2d %10s %8s\n”, event, file, line, id, classname  
}  
t = Test.new  
t.test

Run under 1.9:

dave[RUBY3/Book 22:09:47\*] ruby -v t.rb  
ruby 1.9.0 (2008-06-16 revision 15427) [i686-darwin9.3.0]  
c-return t.rb:10 set\_trace\_func Kernel  
c-call t.rb:11 new Class  
c-call t.rb:11 initialize BasicObject  
c-return t.rb:11 initialize BasicObject  
c-return t.rb:11 new Class

But, under 1.8:

dave[RUBY3/Book 22:11:17\*] /usr/bin/ruby -v t.rb  
ruby 1.8.6 (2007-09-24 patchlevel 111) [universal-darwin9.0]  
line t.rb:11 false  
c-call t.rb:11 new Class  
c-call t.rb:11 initialize Object  
c-return t.rb:11 initialize Object  
c-return t.rb:11 new Class  
line t.rb:12 false  
call t.rb:2 test Test  
line t.rb:3 test Test  
line t.rb:4 test Test  
return t.rb:3 test Test

If this is deliberate, I’ll update the documentation in the book.

Dave