/in/foo.cc:7:9: error: array bound is not an integer constant before ']' token
 int di[a][b];
         ^
/in/foo.cc:7:12: error: array bound is not an integer constant before ']' token
 int di[a][b];
            ^
/in/foo.cc:9:1: error: expected initializer before 'int'
 int main();
 ^~~
/in/foo.cc:10:1: error: expected unqualified-id before '{' token
 {
 ^