test with nest union

examples/book/book.h

@@ -6,36 +6,44 @@
 #include <string.h>
 
 typedef struct {
-    char *caption;
-    int32_t start;
-    int32_t end;
+  char *caption;
+  int32_t start;
+  int32_t end;
 } chapter_t;
 
 typedef struct {
-    uint64_t isbn;
-    uint32_t year;
+  uint64_t isbn;
+  uint32_t year;
 } publish_t;
-    
+
 typedef struct {
-    int null_;
+  int null_;
 } nulldata_t;
 
 typedef struct {
-    char *title;
-    int   n_authors;
-    char **authors;
-    int   n_chapters;
-    chapter_t **chapters_;
-    publish_t *publish;
-    nulldata_t *nulldata;
-    int   n_magic1;
-    uint32_t *magic_1;
-    char *description;
-    int   acquire_method;
-    union {
-	char *buy;
-	char *donation;
-    } acquire;
+  char *from;
+  int with_recipe;
+  union {
+    char *recipe_addr;
+  } u;
+} buy_t;
+
+typedef struct {
+  char *title;
+  int n_authors;
+  char **authors;
+  int n_chapters;
+  chapter_t **chapters_;
+  publish_t *publish;
+  nulldata_t *nulldata;
+  int n_magic1;
+  uint32_t *magic_1;
+  char *description;
+  int acquire_method;
+  union {
+    buy_t *buy;
+    char *donation;
+  } acquire;
 } book_t;
 
 #endif