foo.cc:4:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    4 | main()
      |      ^
foo.cc: In function 'int main()':
foo.cc:6:7: error: unable to find string literal operator 'operator""enjoy' with 'const char [1]', 'long unsigned int' arguments
    6 | cout<<""enjoy yourself"";
      |       ^~~~~~~

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