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struct mah_struct {
    std::wstring member;
    std::size_t hash_cache;
    void lookup(hash_map<std::wstring, int>& x) {
        x.find(member, [&](std::string&) { return hash_cache; });
    }
};

prog.cpp:2:5: error: 'wstring' in namespace 'std' does not name a type
prog.cpp:3:5: error: 'size_t' in namespace 'std' does not name a type
prog.cpp:4:17: error: 'hash_map' has not been declared
prog.cpp:4:25: error: expected ',' or '...' before '<' token
prog.cpp: In member function 'void mah_struct::lookup(int)':
prog.cpp:5:9: error: 'x' was not declared in this scope
prog.cpp:5:16: error: 'member' was not declared in this scope
prog.cpp:5:33: error: 'std::string' has not been declared
prog.cpp: In lambda function:
prog.cpp:5:51: error: 'hash_cache' was not declared in this scope
prog.cpp:5:63: error: return-statement with a value, in function returning 'void'

Standard output is empty