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

diff --git a/compiler/typecheck/TcSimplify.lhs b/compiler/typecheck/TcSimplify.lhs
index 1278662..95250f8 100644 (file)
--- a/compiler/typecheck/TcSimplify.lhs
+++ b/compiler/typecheck/TcSimplify.lhs
@@ -863,7 +863,8 @@ bindIrredsR loc qtvs co_vars reft givens irreds
        
        ; let all_tvs = qtvs ++ co_vars -- Abstract over all these
        ; (implics, bind) <- makeImplicationBind loc all_tvs reft givens' irreds'
-                               -- This call does the real work
+                       -- This call does the real work
+                       -- If irreds' is empty, it does something sensible
        ; extendLIEs implics
        ; return bind } 
 
@@ -876,6 +877,8 @@ makeImplicationBind :: InstLoc -> [TcTyVar] -> Refinement
 -- The binding looks like
 --     (ir1, .., irn) = f qtvs givens
 -- where f is (evidence for) the new implication constraint
+--     f :: forall qtvs. {reft} givens => (ir1, .., irn)
+-- qtvs includes coercion variables
 --
 -- This binding must line up the 'rhs' in reduceImplication
 makeImplicationBind loc all_tvs reft