Main.cc:7:5: error: storage size of 'a' isn't known
    7 | int a[];
      |     ^
Main.cc: In function 'int main()':
Main.cc:27:2: error: expected '}' at end of input
   27 | {
      | ~^
Main.cc:27:2: error: expected '}' at end of input
Main.cc:9:1: note: to match this '{'
    9 | {
      | ^