Workaround for strange compiler error on VS2015 Update 1

Status Job ID Name Coverage
  Test
passed #1833
Linux
clang-c++11

00:21:18

passed #1835
Linux
clang-c++98

00:16:22

passed #1832
Linux
gcc-c++11

00:04:57

passed #1834
Linux
gcc-c++98

00:04:24

passed #1836
Apple
macos-c++11

00:14:41

passed #1837
Apple
macos-c++98

00:09:14