foo.c: In function 'main':
foo.c:7:5: warning: 'main' is normally a non-static function [-Wmain]
    7 | int main()
      |     ^~~~
foo.c:23:1: error: expected declaration or statement at end of input
   23 | }
      | ^
foo.c: At top level:
foo.c:7:5: warning: 'main' defined but not used [-Wunused-function]
    7 | int main()
      |     ^~~~

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