こんばんは、sheepman です。

以下のようにするとエラーになります。

$ bc-rdoc.rb diff --bc=db --ri=ris/1.8 Benchmark::Tms -c
(中略)
#@# bc-rdoc: detected missing name: add!
--- Benchmark::Tms#add!

An in-place version of #add.
#@# bc-rdoc: detected missing name: format
/home/sheepman/ruby/ref/bitclust/bin/bc-rdoc.rb:627:in `list': stack level too deep (SystemStackError)
        from /home/sheepman/ruby/ref/bitclust/bin/bc-rdoc.rb:599:in `format_element'
        from /home/sheepman/ruby/ref/bitclust/bin/bc-rdoc.rb:645:in `list'
        from /home/sheepman/ruby/ref/bitclust/bin/bc-rdoc.rb:645:in `map'
        from /home/sheepman/ruby/ref/bitclust/bin/bc-rdoc.rb:645:in `list'
        from /home/sheepman/ruby/ref/bitclust/bin/bc-rdoc.rb:599:in `format_element'
        from /home/sheepman/ruby/ref/bitclust/bin/bc-rdoc.rb:645:in `list'
        from /home/sheepman/ruby/ref/bitclust/bin/bc-rdoc.rb:645:in `map'
        from /home/sheepman/ruby/ref/bitclust/bin/bc-rdoc.rb:645:in `list'
         ... 1331 levels...
        from /home/sheepman/ruby/ref/bitclust/bin/bc-rdoc.rb:202:in `each'
        from /home/sheepman/ruby/ref/bitclust/bin/bc-rdoc.rb:202:in `exec'
        from /home/sheepman/ruby/ref/bitclust/bin/bc-rdoc.rb:77:in `main'
        from /home/sheepman/ruby/ref/bitclust/bin/bc-rdoc.rb:672

-- 
sheepman / TAMURA Takashi
sheepman@s...

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