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fuzzing crash in simplecpp::Macro::expandToken() #409

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@firewave
#define P(p)defined E##p
P()
simplecpp.cpp:2086:59: runtime error: member call on null pointer of type 'const struct Token'
    #0 0x62ffeca183e7 in simplecpp::Macro::expandToken(simplecpp::TokenList*, simplecpp::Location const&, simplecpp::Token const*, std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, simplecpp::Macro, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, simplecpp::Macro> > > const&, std::set<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&, std::vector<simplecpp::Token const*, std::allocator<simplecpp::Token const*> > const&) const /home/user/CLionProjects/simplecpp/simplecpp.cpp:2086
    #1 0x62ffeca0d33d in simplecpp::Macro::expand(simplecpp::TokenList*, simplecpp::Location const&, simplecpp::Token const*, std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, simplecpp::Macro, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, simplecpp::Macro> > > const&, std::set<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >) const /home/user/CLionProjects/simplecpp/simplecpp.cpp:1918
    #2 0x62ffeca24768 in simplecpp::Macro::expand(simplecpp::TokenList*, simplecpp::Token const*, std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, simplecpp::Macro, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, simplecpp::Macro> > > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&) const /home/user/CLionProjects/simplecpp/simplecpp.cpp:1571
    #3 0x62ffec996457 in preprocessToken /home/user/CLionProjects/simplecpp/simplecpp.cpp:3259
    #4 0x62ffec9afafc in simplecpp::preprocess(simplecpp::TokenList&, simplecpp::TokenList const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, simplecpp::TokenList*, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, simplecpp::TokenList*> > >&, simplecpp::DUI const&, std::__cxx11::list<simplecpp::Output, std::allocator<simplecpp::Output> >*, std::__cxx11::list<simplecpp::MacroUsage, std::allocator<simplecpp::MacroUsage> >*, std::__cxx11::list<simplecpp::IfCond, std::allocator<simplecpp::IfCond> >*) /home/user/CLionProjects/simplecpp/simplecpp.cpp:3747
    #5 0x62ffec95f10b in main /home/user/CLionProjects/simplecpp/main.cpp:136
    #6 0x7b7eb2234e07  (/usr/lib/libc.so.6+0x25e07) (BuildId: aed3a2b0cf4e6cc12296052529af22f6a450a75a)
    #7 0x7b7eb2234ecb in __libc_start_main (/usr/lib/libc.so.6+0x25ecb) (BuildId: aed3a2b0cf4e6cc12296052529af22f6a450a75a)
    #8 0x62ffec962b24 in _start (/home/user/CLionProjects/simplecpp/simplecpp+0xd0b24) (BuildId: 578f1f19369ff6da7f1b6f13ef333782db2d1107)

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