X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcUnify.lhs;h=b2782d6399232e96fff74e0afd795d2affbec33d;hb=2eb04ca0f8d0ec72b417cddc60672c696b4a3daa;hp=e1b4bd4d57aea188a131971bd7aafa56158b9a33;hpb=a12d2d74ef1d05b6815906ea5d29b79249191383;p=ghc-hetmet.git

diff --git a/compiler/typecheck/TcUnify.lhs b/compiler/typecheck/TcUnify.lhs
index e1b4bd4..b2782d6 100644
--- a/compiler/typecheck/TcUnify.lhs
+++ b/compiler/typecheck/TcUnify.lhs
@@ -1780,6 +1780,10 @@ unifyFunKind other		       = returnM Nothing
 checkExpectedKind :: Outputable a => a -> TcKind -> TcKind -> TcM ()
 -- A fancy wrapper for 'unifyKind', which tries 
 -- to give decent error messages.
+-- 	(checkExpectedKind ty act_kind exp_kind)
+-- checks that the actual kind act_kind is compatible 
+-- 	with the expected kind exp_kind
+-- The first argument, ty, is used only in the error message generation
 checkExpectedKind ty act_kind exp_kind
   | act_kind `isSubKind` exp_kind -- Short cut for a very common case
   = returnM ()