Improve the Hoogle backend's treatment of type families (#808)

Fixes parts 1 and 2 of #806.

2 files changed, 47 insertions, 0 deletions

diff --git a/hoogle-test/ref/Bug806/test.txt b/hoogle-test/ref/Bug806/test.txt
new file mode 100644
index 00000000..d9a908b3
--- /dev/null
+++ b/hoogle-test/ref/Bug806/test.txt
@@ -0,0 +1,24 @@
+-- Hoogle documentation, generated by Haddock
+-- See Hoogle, http://www.haskell.org/hoogle/
+
+@package test
+@version 0.0.0
+
+module Bug806
+
+-- | <a>F1</a> docs
+type family F1 a b :: * -> *
+
+-- | <a>F2</a> docs
+type family F2 a b :: * -> *
+
+-- | <a>D</a> docs
+data family D a :: * -> *
+v :: Int
+
+-- | <a>C</a> docs
+class C a where {
+    
+    -- | <a>AT</a> docs
+    type family AT a;
+}
diff --git a/hoogle-test/src/Bug806/Bug806.hs b/hoogle-test/src/Bug806/Bug806.hs
new file mode 100644
index 00000000..6efcb5cf
--- /dev/null
+++ b/hoogle-test/src/Bug806/Bug806.hs
@@ -0,0 +1,23 @@
+{-# LANGUAGE KindSignatures #-}
+{-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE UndecidableInstances #-}
+module Bug806 where
+
+import Data.Proxy
+
+-- | 'F1' docs
+type family F1 a b :: * -> *
+-- | 'F2' docs
+type family F2 a b :: * -> * where
+  F2 Int b = Maybe
+  F2 a   b = []
+-- | 'D' docs
+data family D a :: * -> *
+
+v :: Int
+v = 42
+
+-- | 'C' docs
+class C a where
+  -- | 'AT' docs
+  type AT a