foo.cc:20:2: error: stray '#' in program
   20 | }#include <iostream>
      |  ^
foo.cc:20:3: error: 'include' does not name a type
   20 | }#include <iostream>
      |   ^~~~~~~
foo.cc:23:5: error: redefinition of 'int main()'
   23 | int main()
      |     ^~~~
foo.cc:4:5: note: 'int main()' previously defined here
    4 | int main()
      |     ^~~~

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