#define M(T) _Generic((T),int:12);

typedef struct ast_range {int i;} ast_range;
typedef struct ast_if ast_if;
typedef struct ast_value ast_value;
typedef struct ast_expr ast_expr;
typedef struct ast_root ast_root;
typedef struct ast_expr_cmp ast_expr_cmp;
typedef struct ast_expr_bitwise ast_expr_bitwise;

#define ALLOC_MEMSET(T,VAL) {VAL=malloc(sizeof(T));memset(VAL,0,sizeof(T));}



int fun()
{
	char *root;
	ALLOC_MEMSET(ast_range,root);
}