1 files changed, 5 insertions, 0 deletions
diff --git a/TODO b/TODO
index a6503d78..a6e2d656 100644
--- a/TODO
+++ b/TODO
@@ -20,6 +20,11 @@
 -----------------------------------------------------------------------------
 -- bugs
 
+* parenthises are sometimes dropped in data declarations, e.g.
+    data Improving a = IV a (a -> Ordering)
+  becomes
+    data Improving a = IV a a -> Ordering
+
 * parser doesn't support doc comments on types in type aliases:
     type MyInt = Int -- ^ comment