# Bug in flog?

**URL:** <https://www.ruby-forum.com/t/bug-in-flog/196307>\
**Category:** Ruby\
**Created:** [October 11, 2010, 12:03pm UTC](https://www.ruby-forum.com/t/bug-in-flog/196307 "2010-10-11T12:03:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![micheldogger](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/b5e925/32.png) [@micheldogger](https://www.ruby-forum.com/u/micheldogger)\
**Post date:** [October 11, 2010, 12:03pm UTC](https://www.ruby-forum.com/t/bug-in-flog/196307/1 "2010-10-11T12:03:43Z")

</div>

Minimal case : bug appears when adding this two lines  
=begin  
=end  
at the end of a file, and disappears when taking them out.

```
from <internal:lib/rubygems/custom_require>:29:in `require'

```

F:/Ruby191/lib/ruby/gems/1.9.1/gems/ruby\_parser-2.0.5/lib/ruby\_lexer.rb:739:in  
`block in yylex': you shouldn't be able to get here (RuntimeError) from F:/Ruby191/lib/ruby/gems/1.9.1/gems/ruby_parser-2.0.5/lib/ruby_lexer.rb:649:in`loop’  
from  
F:/Ruby191/lib/ruby/gems/1.9.1/gems/ruby\_parser-2.0.5/lib/ruby\_lexer.rb:649:in  
`yylex' from F:/Ruby191/lib/ruby/gems/1.9.1/gems/ruby_parser-2.0.5/lib/ruby_lexer.rb:68:in`advance’  
from  
F:/Ruby191/lib/ruby/gems/1.9.1/gems/ruby\_parser-2.0.5/lib/ruby\_parser\_extras.rb:712:in  
`next_token' from F:/Ruby192/lib/ruby/1.9.1/racc/parser.rb:99:in`\_racc\_do\_parse\_c’  
from F:/Ruby192/lib/ruby/1.9.1/racc/parser.rb:99:in `do_parse' from F:/Ruby191/lib/ruby/gems/1.9.1/gems/ruby_parser-2.0.5/lib/ruby_parser_extras.rb:749:in`process’  
from  
F:/Ruby191/lib/ruby/gems/1.9.1/gems/flog-2.5.0/lib/flog.rb:241:in `block in flog' from F:/Ruby191/lib/ruby/gems/1.9.1/gems/flog-2.5.0/lib/flog.rb:235:in`each’  
from  
F:/Ruby191/lib/ruby/gems/1.9.1/gems/flog-2.5.0/lib/flog.rb:235:in `flog' from F:/Ruby191/lib/ruby/gems/1.9.1/gems/flog-2.5.0/bin/flog:13:in`\<top  
(required)\>’  
from F:/Ruby192/bin/flog:19:in `load' from F:/Ruby192/bin/flog:19:in`’

\_md

---

<div class="post-metadata">

**Author:** ![micheldogger](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/b5e925/32.png) [@micheldogger](https://www.ruby-forum.com/u/micheldogger)\
**Post date:** [October 12, 2010, 1:42am UTC](https://www.ruby-forum.com/t/bug-in-flog/196307/2 "2010-10-12T01:42:01Z")

</div>

On Oct 11, 3:03am, Michel D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> Minimal case : bug appears when adding this two lines  
> =begin  
> =end

I’m quite incredulous that someone else has so recently noticed such a  
similarly esoteric problem in flog.  
The following is my case:

dking1@SDGL07L3AED1G $ cat foo.rb

# 

=begin  
=end  
dking1@SDGL07L3AED1G $ ruby foo.rb  
dking1@SDGL07L3AED1G $ flog foo.rb  
C:/Ruby/in-use/lib/ruby/gems/1.8/gems/ruby\_parser-2.0.5/lib/  
ruby\_lexer.rb:739:in `yylex': you shouldn't be able to get here (RuntimeError) from C:/Ruby/in-use/lib/ruby/gems/1.8/gems/ruby_parser-2.0.5/lib/ ruby_lexer.rb:649:in `loop’  
from C:/Ruby/in-use/lib/ruby/gems/1.8/gems/ruby\_parser-2.0.5/lib/  
ruby\_lexer.rb:649:in `yylex' from C:/Ruby/in-use/lib/ruby/gems/1.8/gems/ruby_parser-2.0.5/lib/ ruby_lexer.rb:68:in `advance’  
from C:/Ruby/in-use/lib/ruby/gems/1.8/gems/ruby\_parser-2.0.5/lib/  
ruby\_parser\_extras.rb:712:in `next_token' from C:/Ruby/in-use/lib/ruby/1.8/racc/parser.rb:99:in `\_racc\_do\_parse\_c’  
from C:/Ruby/in-use/lib/ruby/1.8/racc/parser.rb:99:in ` __send__' from C:/Ruby/in-use/lib/ruby/1.8/racc/parser.rb:99:in `do\_parse’  
from C:/Ruby/in-use/lib/ruby/gems/1.8/gems/ruby\_parser-2.0.5/lib/  
ruby\_parser\_extras.rb:749:in `process' from C:/Ruby/in-use/lib/ruby/gems/1.8/gems/flog-2.5.0/lib/flog.rb: 241:in `flog’  
from C:/Ruby/in-use/lib/ruby/gems/1.8/gems/flog-2.5.0/lib/flog.rb:  
235:in `each' from C:/Ruby/in-use/lib/ruby/gems/1.8/gems/flog-2.5.0/lib/flog.rb: 235:in `flog’  
from C:/Ruby/in-use/lib/ruby/gems/1.8/gems/flog-2.5.0/bin/flog:13  
from c:/Ruby/in-use/bin/flog:19:in `load’  
from c:/Ruby/in-use/bin/flog:19  
dking1@SDGL07L3AED1G $ ruby -v  
ruby 1.8.6 (2008-08-11 patchlevel 287) [i386-mswin32]  
dking1@SDGL07L3AED1G $ gem list flog  
flog (2.5.0)

And the plot thickens (same ruby & flog versions):

dking1@SDGL07L3AED1G $ cat foo.rb  
=begin  
=end  
dking1@SDGL07L3AED1G $ ruby foo.rb  
dking1@SDGL07L3AED1G $ flog foo.rb  
0.0: flog total  
0.0: flog/method average

Thoughts?