040000 tree 574cb8e6ab0ff0adb18420223fc034185b232745	debian8_clang
040000 tree da28040cf1b08a1bd742036b00651dbf6c2c77de	experimental
040000 tree 247c49b8ef0957e67e09002e0bc7ae48a5c3b9fe	java
040000 tree 77afddd9398606582db886841e6850f7a3c820ec	ubuntu16_04_clang