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[ghc-hetmet.git] / compiler / typecheck / TcUnify.lhs

diff --git a/compiler/typecheck/TcUnify.lhs b/compiler/typecheck/TcUnify.lhs
index e1b4bd4..b2782d6 100644 (file)
--- 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 ()