diff -ru orig/System/Log/FastLogger.hs new/System/Log/FastLogger.hs
--- orig/System/Log/FastLogger.hs	2013-12-24 10:23:27.725895194 +0200
+++ new/System/Log/FastLogger.hs	2013-12-24 10:23:27.000000000 +0200
@@ -13,6 +13,8 @@
   -- * Log messages
   , LogStr
   , ToLogStr(..)
+  , logStrLength
+  , logStrBuilder
   -- * Writing a log message
   , pushLogStr
   -- * Flushing buffered log messages