segmentation fault (core dumped)

[rcuu]

I set YAML_CPP_SUPPORT_MERGE_KEYS in the merge-key-support branch to "on" and successfully compiled, but when I simply use the library, I found that the program reported a segmentation-fault error.

Here is my demo.cpp code:

#include <iostream>
#include "yaml-cpp/yaml.h"
using namespace std;
using namespace YAML;

int main() {
  Node node = Load("{a: 1, <<: {a: 2}}");
  return 0;
}

The report：

segmentation fault (core dumped)

Others：
I compiled it to the /home/xxx/tRelease directory, and here is my simple CMakeLists.txt:

CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
PROJECT(YAMLdemo) 

INCLUDE_DIRECTORIES(/home/xxx/TReleases/include/yaml-cpp/)
LINK_DIRECTORIES(/home/xxx/TReleases/lib/)

ADD_EXECUTABLE(demo ./demo.cpp)
TARGET_LINK_LIBRARIES(demo yaml-cpp)

os: ubuntu 18.04