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#include <stdio.h>
 
int main() {
  for(;printf("hello");)
    switch(0)
      if((struct foo*)1 == (enum foo1*)1 )
        case 0:
          do goto l; while((union bar*)1);
      else
l:
        default:
          return sizeof(void(*)(volatile signed int, unsigned long, register char, short, float, double ));
}

prog.cpp: In function ‘int main()’:
prog.cpp:6:34: error: use of enum ‘foo1’ without previous declaration
prog.cpp:6:34: error: use of enum ‘foo1’ without previous declaration
prog.cpp:6:29: error: expected primary-expression before ‘enum’
prog.cpp:6:29: error: expected ‘)’ before ‘enum’
prog.cpp:8:20: error: expected ‘)’ before ‘;’ token
prog.cpp:9:7: error: ‘else’ without a previous ‘if’
prog.cpp:11:9: error: case label not within a switch statement
prog.cpp:10:1: warning: label ‘l’ defined but not used [-Wunused-label]

Standard output is empty