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widget *p;

/* ... */

p = (widget *)malloc(sizeof(widget)); /* invalid assignment */

enum month { Jan, Feb, ... };
typetypedef enum month month;

typedef enumstruct date date;
struct date {
  unsigned char dd;
  month mm;
  unsigned yy;
};

typedef struct string string;
struct string {
  size_t length;
  char text[];
};

date *d, *week, *fortnight;
string *name;

d = MALLOC(date);
week = MALLOC_ARRAY(7, date);
name = MALLOC_FLEX(string, 16, char);
fortnight = CALLOC(14, date);