C question about array of structs

c_question.md

typedef struct transition* Transition;
typedef struct state* State;

struct state {
  int goal;
  int transition_cnt;
  Transition transitions; // points to a transition[]
};

struct transition {
  char el;
  State next_state;
};

struct transition t;
struct state s;
s.goal = 0;
s.transition_cnt = 1;
// I'd like to assign a one-element array {t} to the transitions pointer of s
s.transitions = &{t}; // this raises an error 'expected expression' in xcode