boost_no_com_value_init.ipp: out of bounds array access

[Kojoley]

$ clang++ -I../../.. -fsanitize=undefined config_test.cpp && a
boost_no_com_value_init.ipp:429:11: runtime error: index 4 out of bounds for type 'char const[4]'
boost_no_com_value_init.ipp:443:11: runtime error: index 7 out of bounds for type 'char const[7]'