requires xcode 10, apparently, for optional.

This commit is contained in:
Kelvin Sherlock 2019-12-10 23:09:04 -05:00
parent 3aab0a4735
commit e3aa60be6a

View File

@ -1,4 +1,5 @@
dist: bionic
osx_image: xcode10
language: cpp
os:
- osx