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  1. #include <iostream>
  2.  
  3. enum test;
  4. //Then some time later...
  5. enum test {RED, BLUE, GREEN};
  6.  
  7. int main() {
  8. test t = RED;
  9.  
  10. return 0;
  11. }
Compilation error #stdin compilation error #stdout 0s 0KB
stdin
Standard input is empty
compilation info
prog.cpp:3:6: error: use of enum ‘test’ without previous declaration
 enum test;
      ^~~~
stdout
Standard output is empty