Control structures

• for (..; void; ..) .. if the for end test form is not empty and returns no value.
• for without test and body, I think it too dangerous !
• if (void) .. when the if test form returns no value.
• (void) ? .. : .. if the test form returns no value.
• while (void) .. when the while test form returns no value.
• do .. while(void) when the do while test form returns no value.
• more than one default: in switch
• duplicate case <caseentry>
• case <caseentry> out of switch

  { case 1: ; } /* case 1 out of switch */

• illegal break or illegal continue when you use a break or a continue out of a loop or a switch.

  { continue; }

• return at top level signals a return out of a function.

  { return; }