Add another TODO item.

diff --git a/doc/TODO b/doc/TODO
index 2f8af09cd7a528b114a3aa8bc0438eb952bd8617..1e6a51662f425b9d2156f8e96c889de6ea45809c 100644 (file)
--- a/doc/TODO
+++ b/doc/TODO
@@ -8,3 +8,9 @@
 * Figure out why TC.prop_c0120_identity4 and friends are failing.
 
 * Figure out why the section (2.5) c_ijk1 identity is failing.
+
+* Use distribution combinators[1] to get rid of the orphan instance
+  warnings.
+
+
+[1] http://stackoverflow.com/questions/4001861/how-small-should-i-make-make-modules-in-haskell