master build failure

[matthiaskrgr]

repo @ ea5945b

[ 75%/3/1/4,3.557] Building CXX object src/CMakeFiles/boost_unit_tests.dir/tests/gui/fire_event.cpp.o
FAILED: src/CMakeFiles/boost_unit_tests.dir/tests/gui/fire_event.cpp.o
/home/matthias/LLVM/LLVM_dev/stage_2/build/bin/clang++  -DBOOST_TEST_DYN_LINK -DFIFODIR=\"/var/run/wesnothd\" -DHAS_RELATIVE_LOCALEDIR=1 -DHAVE_CONFIG_H -DHAVE_FRIBIDI -DHAVE_HISTORY -DHAVE_LIBDBUS -DLOCALEDIR=\"translations\" -DLUA_USE_POSIX -DWESNOTH_PATH=\"/usr/local/share/wesnoth\" -D_X11 -isystem /usr/include/uuid -isystem /usr/include/freetype2 -isystem /usr/include/libpng16 -isystem /usr/include/harfbuzz -isystem /usr/include/glib-2.0 -isystem /usr/lib/glib-2.0/include -isystem /usr/include/pango-1.0 -isystem /usr/include/fribidi -isystem /usr/include/cairo -isystem /usr/include/pixman-1 -isystem /usr/include/dbus-1.0 -isystem /usr/lib/dbus-1.0/include -isystem /usr/include/SDL2 -I../src -Isrc -std=c++14 -Wall -Wextra -Werror=non-virtual-dtor -Wno-unused-local-typedefs -Wno-maybe-uninitialized -Wold-style-cast -Wtrampolines -Qunused-arguments -Wno-unknown-warning-option -Wmismatched-tags -Wno-conditional-uninitialized -fsanitize=address,undefined -g3 -I/usr/include/boost -Og -fno-omit-frame-pointer -march=native -fsanitize-address-use-after-scope  -fno-optimize-sibling-calls   -O0 -DDEBUG -ggdb3     -I/usr/include/SDL2 -I/usr/include -D_REENTRANT -MD -MT src/CMakeFiles/boost_unit_tests.dir/tests/gui/fire_event.cpp.o -MF src/CMakeFiles/boost_unit_tests.dir/tests/gui/fire_event.cpp.o.d -o src/CMakeFiles/boost_unit_tests.dir/tests/gui/fire_event.cpp.o -c ../src/tests/gui/fire_event.cpp
../src/tests/gui/fire_event.cpp:137:36: error: unexpected ':' in nested name specifier; did you mean '::'?
        auto child = std::make_shared<gui2:grid>(1, 1);
                                          ^
                                          ::
1 error generated.
ninja: build stopped: cannot make progress due to previous errors.