X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftlist%2Ftlist.h;h=937a834c0184fb4d54928ca57db9668a929b1f8c;hp=1ce0b85ed9f03c01333c8412c2d260541f8724cb;hb=919b97d6e573eb794d7819f1af8da29023d6b193;hpb=a6b5111fe6948e51114c33aa34785c9fd0d403e6

diff --git a/ccan/tlist/tlist.h b/ccan/tlist/tlist.h
index 1ce0b85e..937a834c 100644
--- a/ccan/tlist/tlist.h
+++ b/ccan/tlist/tlist.h
@@ -185,6 +185,8 @@
  * Example:
  *	struct child *first;
  *	first = tlist_top(&parent->children, list);
+ *	if (!first)
+ *		printf("Empty list!\n");
  */
 #define tlist_top(h, member)						\
 	((tcon_type((h), canary))					\
@@ -202,6 +204,8 @@
  * Example:
  *	struct child *last;
  *	last = tlist_tail(&parent->children, list);
+ *	if (!last)
+ *		printf("Empty list!\n");
  */
 #define tlist_tail(h, member)						\
 	((tcon_type((h), canary))					\