Homebrew/homebrew — pull request #29718 by davidfokkema (2014-05-30 20:56:06+00:00)
Title: `brew ls --removed`: list formulae removed from Homebrew

Currently for me:
```
$ brew ls --removed
gfortran
```
I still have gfortran installed, but it is no longer included in Homebrew. Who knew? Well, now you know.