brew install mecab-ipadicでsyntax error

2018/10/13版でbrewインストールを行ったところエラーが発生した。
環境はmacOS Sierra。

$ brew install mecab-ipadic
Error: mecab-ipadic: /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/mecab-ipadic.rb:39: syntax error, unexpected <<
    <<~EOS
      ^
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/mecab-ipadic.rb:40: syntax error, unexpected tIDENTIFIER, expecting keyword_do or '{' or '('
... enable mecab-ipadic dictionary, add to #{HOMEBREW_PREFIX}/e...
...                               ^
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/mecab-ipadic.rb:40: syntax error, unexpected tIDENTIFIER, expecting keyword_do or '{' or '('
...mecab-ipadic dictionary, add to #{HOMEBREW_PREFIX}/etc/mecab...
...                               ^

syntax errorを以下のように修正。

$ diff mecab-ipadic.rb.old mecab-ipadic.rb.new 
39c39
<     <<~EOS
---
>     <<-EOS

再度実行でインストール完了。

$ brew install mecab-ipadic                                                         
==> Downloading https://homebrew.bintray.com/bottles/mecab-ipadic-2.7.0-20070801.sierra.bottle.tar.gz
######################################################################## 100.0%
==> Pouring mecab-ipadic-2.7.0-20070801.sierra.bottle.tar.gz
==> Using the sandbox
==> Caveats
      To enable mecab-ipadic dictionary, add to /usr/local/etc/mecabrc:
        dicdir = /usr/local/lib/mecab/dic/ipadic
==> Summary
🍺  /usr/local/Cellar/mecab-ipadic/2.7.0-20070801: 15 files, 50.6MB