http: verbose assertions

This makes it easier for bug reporters to tell us what's
wrong in case line numbers change.

1 files changed, 1 insertions, 1 deletions

diff --git a/ext/unicorn_http/c_util.h b/ext/unicorn_http/c_util.h
index 04fd05d..0ab9b31 100644
--- a/ext/unicorn_http/c_util.h
+++ b/ext/unicorn_http/c_util.h
@@ -56,7 +56,7 @@ static int hexchar2int(int xdigit)
     return xdigit - 'a' + 10;
 
   /* Ragel already does runtime range checking for us in Unicorn: */
-  assert(xdigit >= '0' && xdigit <= '9');
+  assert(xdigit >= '0' && xdigit <= '9' && "invalid digit character");
 
   return xdigit - '0';
 }