X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcSimplify.lhs;h=932cb68f425ba706a4114cbd1a1c2e3396a72c60;hp=cb6021ccf429a81927e02ac693fa01c8ab793608;hb=e79c9ce01d0ce4412bd4bcd99c8c728a6a2ec569;hpb=fbbd2bfaa54b4424edc70cbc4bd4ff29e324f6a2

diff --git a/compiler/typecheck/TcSimplify.lhs b/compiler/typecheck/TcSimplify.lhs
index cb6021c..932cb68 100644
--- a/compiler/typecheck/TcSimplify.lhs
+++ b/compiler/typecheck/TcSimplify.lhs
@@ -16,6 +16,8 @@ module TcSimplify (
 
 	tcSimplifyDeriv, tcSimplifyDefault,
 	bindInstsOfLocalFuns, 
+	
+        tcSimplifyStagedExpr,
 
         misMatchMsg
     ) where
@@ -58,6 +60,7 @@ import Util
 import SrcLoc
 import DynFlags
 import FastString
+
 import Control.Monad
 import Data.List
 \end{code}
@@ -861,7 +864,7 @@ Note [NO TYVARS]
 
 The excitement comes when simplifying the bindings for h.  Initially
 try to simplify {y @ [[t1]] t2, 0 @ t1}, with initial qtvs = {t2}.
-From this we get t1:=:t2, but also various bindings.  We can't forget
+From this we get t1~t2, but also various bindings.  We can't forget
 the bindings (because of [LOOP]), but in fact t1 is what g is
 polymorphic in.  
 
@@ -977,7 +980,7 @@ makeImplicationBind :: InstLoc -> [TcTyVar]
 --	(ir1, .., irn) = f qtvs givens
 -- where f is (evidence for) the new implication constraint
 --	f :: forall qtvs. givens => (ir1, .., irn)
--- qtvs includes coercion variables.
+-- qtvs includes coercion variables
 --
 -- This binding must line up the 'rhs' in reduceImplication
 makeImplicationBind loc all_tvs
@@ -997,7 +1000,7 @@ makeImplicationBind loc all_tvs
 	      name = mkInternalName uniq (mkVarOcc "ic") span
 	      implic_inst = ImplicInst { tci_name = name,
 					 tci_tyvars = all_tvs, 
-					 tci_given = (eq_givens ++ dict_givens),
+					 tci_given = eq_givens ++ dict_givens,
                                                        -- same order as binders
 					 tci_wanted = irreds, 
                                          tci_loc = loc }
@@ -3014,6 +3017,26 @@ tcSimplifyDefault theta = do
     doc = ptext (sLit "default declaration")
 \end{code}
 
+@tcSimplifyStagedExpr@ performs a simplification but does so at a new
+stage. This is used when typechecking annotations and splices.
+
+\begin{code}
+
+tcSimplifyStagedExpr :: ThStage -> TcM a -> TcM (a, TcDictBinds)
+-- Type check an expression that runs at a top level stage as if
+--   it were going to be spliced and then simplify it
+tcSimplifyStagedExpr stage tc_action
+  = setStage stage $ do { 
+        -- Typecheck the expression
+	  (thing', lie) <- getLIE tc_action
+	
+	-- Solve the constraints
+	; const_binds <- tcSimplifyTop lie
+	
+	; return (thing', const_binds) }
+
+\end{code}
+
 
 %************************************************************************
 %*									*