[brew] 맥 OS에서 scala 업그레이드

맥에서 scala 2.11.8이 설치된 상태에서 scala 2.12.1을 설치할 때..

brew를 사용 중이라면 brew unlink scala를 실행한 후 brew install scala를 실행한다. 

$ brew unlink scala

Unlinking /usr/local/Cellar/scala/2.11.8... 12 symlinks removed

$ brew install scala

==> Downloading https://homebrew.bintray.com/bottles/scala-2.12.1.el_capitan.bottle.tar.gz

######################################################################## 100.0%

==> Pouring scala-2.12.1.el_capitan.bottle.tar.gz

==> Caveats

To use with IntelliJ, set the Scala home to:

  /usr/local/opt/scala/idea

Bash completion has been installed to:

  /usr/local/etc/bash_completion.d

==> Summary /usr/local/Cellar/scala/2.12.1: 44 files, 20MB