An infinite loop bug was reported at [ruby-dev:48813](https://bugs.ruby-lang.org/issues/10732). The following hangs up. ``` echo -e '\ra\t' > dummy.txt rdoc dummy.txt ``` Fixed at [r49223](http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=49223), ruby/ruby@77f3125567adc54b8a5534c2c1ded5a19100e8d5