yasslab/railsguides.jp — pull request #40 by sho-h (2014-12-30 15:42:25+00:00)
Title: fix typo

searched with below code(c.f. まつもとゆきひろ コードの世界)

```
#!/usr/bin/ruby

ARGF.each do |line|
print ARGF.file.path, " ",
ARGF.file.lineno, ":",
line if line.gsub!(/([へにおはがでな])\1/s, '[[\&]]')
end
```