Bug#812261: (no subject)

[octoploid]

Building with -fsanitize=undefined shows:

markus@x4 bin % ./util-test
[==========] Running 35 tests from 6 test cases.
[----------] Global test environment set-up.
[----------] 1 test from AllocatorTest
[ RUN      ] AllocatorTest.AllocatorRef
/var/tmp/cppformat/test/../gmock/gmock/gmock.h:10090:60: runtime error: member 
call on null pointer of type 'const struct ResultHolder'
[1]    15511 segmentation fault  ./util-test