niteria authored Mar 05, 2018 and Ben Gamari committed Mar 06, 2018

Since 7aaeaf81
`-g1` and `-g2` are actually different.
The tutorial below is correct.

Test Plan: harbormaster

Reviewers: bgamari, simonmar

Reviewed By: bgamari

Subscribers: rwbarton, thomie, carter

Differential Revision: https://phabricator.haskell.org/D4471

(cherry picked from commit 5b1132eefd0a75189b3527486b492c3dffc7bdf1)