ucc.c
void expect(char op) {
  if (token->kind != TK_RESERVED || token->str[0] != op)
    error("It is not '%c'", op);
  token = token->next;
}
// If next token is expected symbol, read next one token
// If it is not, make error
If next token is expected symbol, read next one token
If it is not, make error
If next token is expected symbol read next one token If it is not make error
void expect(char op) {
  if (token->kind != TK_RESERVED || token->str[0] != op)
    error("It is not '%c'", op);
  token = token->next;
}
void expect ( char op ) { if ( token -> kind != TK_RESERVED || token -> str [ 0 ] != op ) error ( " " , op ) ; token = token -> next ; }
If next token is expected symbol, read next one token
If it is not, make error
If next token is expected symbol read next one token If it is not make error