memory leak when using class selectors about gumbo-query HOT 6 CLOSED

==89570== HEAP SUMMARY:
==89570==     in use at exit: 70,276 bytes in 1,402 blocks
==89570==   total heap usage: 98,778 allocs, 97,376 frees, 3,370,092 bytes allocated
==89570==
==89570== 40,960 bytes in 1,024 blocks are definitely lost in loss record 76 of 76
==89570==    at 0x66BB: malloc (in /usr/local/Cellar/valgrind/3.10.1/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==89570==    by 0x9A28D: operator new(unsigned long) (in /usr/lib/libc++.1.dylib)
==89570==    by 0x100005727: CParser::parseTypeSelector() (in ./parser)
==89570==    by 0x100004AB7: CParser::parseSimpleSelectorSequence() (in ./parser)
==89570==    by 0x100003C8C: CParser::parseSelector() (in ./parser)
==89570==    by 0x100003654: CParser::parseSelectorGroup() (in ./parser)
==89570==    by 0x1000035D3: CParser::create(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) (in ./parser)
==89570==    by 0x10001503E: CSelection::find(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) (in ./parser)
==89570==    by 0x100002925: CDocument::find(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) (in ./parser)
==89570==    by 0x1000022A3: test_parser() (in ./parser)
==89570==    by 0x1000025B2: main (in ./parser)