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#include <stdio.h>
 
    int main()
    {
      int cond = 2;
      switch (cond) {
        case 0: case 1: { /* <- start scope */
          int i = 1;
          printf("case 1: %d\n", i);
        } break; /* <- end scope and jump to end of switch */
        case 2:
          printf("case 2: %d\n", i); /* i is recognized as unknown identifier */
      }
      return 0;
    }
 

prog.c: In function ‘main’:
prog.c:12:34: error: ‘i’ undeclared (first use in this function)
           printf("case 2: %d\n", i); /* i is recognized as unknown identifier */
                                  ^
prog.c:12:34: note: each undeclared identifier is reported only once for each function it appears in

Standard output is empty