foo.cc: In function 'int main()':
foo.cc:21:1: error: a function-definition is not allowed here before '{' token
   21 | {
      | ^
foo.cc:38:1: error: a function-definition is not allowed here before '{' token
   38 | {
      | ^
foo.cc:52:1: error: expected '}' at end of input
   52 | }
      | ^
foo.cc:16:1: note: to match this '{'
   16 | {
      | ^

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