+/* Announce that there has been some malloc done that will be freed
+ * during gc. A typical use is for a smob that uses some malloced
+ * memory but can not get it from scm_must_malloc (for whatever
+ * reason). When a new object of this smob is created you call
+ * scm_done_malloc with the size of the object. When your smob free
+ * function is called, be sure to include this size in the return
+ * value. */