example.c

/* #include <sys/dir.h> */
/* example.c */
/* (tentative) definitions */
/* static c; extern c; */
/* static int c = 3; */
/* static int c; */
/* /\* old style function definition *\/ */
/* void* match(s_ix, l_ix, pat) */
/* 	long l_ix; */
/* char unsigned *pat; */
/* { exit(1); } */
/* /\* typedefs and structs *\/ */
/* typedef struct s { struct { char chr; double dbl; } x,*y; } __attribute__((packed)) S; */
/* struct t { int a; }; */
/* S f(); */
/* static g(S a)  { return 0; } */
/* int main() { printf("%d",sizeof(DIR)); } */

typedef enum { Angstrom, Mile, Kilometre, Lightyear } Distancetype;

typedef struct Distance Distance;

typedef struct Distance {
    Distancetype tag;
    union {
	double angstorms;
	double miles;
	double kilometres;
	struct {
	    double x;
	    double y;
	} lightyear;
    };
};