structures forward-declare then emit their full definition
in topological dependency order.
an alias to a struct emits as a c typedef.
primitives are resolved to c directly on use.

<<<

Point = type { x int, y int }
Node = type { value int, next &Node }
Coord = type Point

main = fun () {
}

>>>

#include "core.c"
struct Point;
struct Node;
struct Point {
    integer x;
    integer y;
};
struct Node {
    integer value;
    struct Node* next;
};
typedef struct Point Coord;
void catskill_main(void);
void catskill_main(void) {
}
#include "runtime.c"