X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2FdeSugar%2FDsGRHSs.lhs;h=8f24239e153c61e8e36a0d360d86260db66a012f;hb=989cfb23660ecefe7e414a1ca1f3004e820ef50b;hp=eea61bafb2cfae76a00e7215de4fc79de759a9c0;hpb=0065d5ab628975892cea1ec7303f968c3338cbe1;p=ghc-hetmet.git

diff --git a/compiler/deSugar/DsGRHSs.lhs b/compiler/deSugar/DsGRHSs.lhs
index eea61ba..8f24239 100644
--- a/compiler/deSugar/DsGRHSs.lhs
+++ b/compiler/deSugar/DsGRHSs.lhs
@@ -1,7 +1,9 @@
 %
+% (c) The University of Glasgow 2006
 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
 %
-\section[DsGRHSs]{Matching guarded right-hand-sides (GRHSs)}
+
+Matching guarded right-hand-sides (GRHSs)
 
 \begin{code}
 module DsGRHSs ( dsGuarded, dsGRHSs ) where
@@ -11,20 +13,22 @@ module DsGRHSs ( dsGuarded, dsGRHSs ) where
 import {-# SOURCE #-} DsExpr  ( dsLExpr, dsLocalBinds )
 import {-# SOURCE #-} Match   ( matchSinglePat )
 
-import HsSyn		( Stmt(..), HsExpr(..), GRHSs(..), GRHS(..), 
-			  LHsExpr, HsMatchContext(..), Pat(..) )
-import CoreSyn		( CoreExpr )
-import Var		( Id )
-import Type		( Type )
+import HsSyn
+import HsUtils
+import CoreSyn
+import Var
+import Type
 
 import DsMonad
 import DsUtils
-import Unique		( Uniquable(..) )
-import PrelInfo		( nON_EXHAUSTIVE_GUARDS_ERROR_ID )
-import TysWiredIn	( trueDataConId )
-import PrelNames	( otherwiseIdKey, hasKey )
-import Name		( Name )
-import SrcLoc		( unLoc, Located(..) )
+import DsBreakpoint
+import Unique
+import PrelInfo
+import TysWiredIn
+import PrelNames
+import Name
+import SrcLoc
+
 \end{code}
 
 @dsGuarded@ is used for both @case@ expressions and pattern bindings.
@@ -54,18 +58,23 @@ dsGRHSs :: HsMatchContext Name -> [Pat Id]	-- These are to build a MatchContext
 	-> GRHSs Id				-- Guarded RHSs
 	-> Type					-- Type of RHS
 	-> DsM MatchResult
-
-dsGRHSs hs_ctx pats (GRHSs grhss binds) rhs_ty
-  = mappM (dsGRHS hs_ctx pats rhs_ty) grhss	`thenDs` \ match_results ->
+dsGRHSs hs_ctx pats (GRHSs grhss binds) rhs_ty =
+   bindLocalsDs (bindsBinders ++ patsBinders) $
+    mappM (dsGRHS hs_ctx pats rhs_ty) grhss	`thenDs` \ match_results ->
     let 
 	match_result1 = foldr1 combineMatchResults match_results
-	match_result2 = adjustMatchResultDs (dsLocalBinds binds) match_result1
+	match_result2 = adjustMatchResultDs 
+                                 (\e -> bindLocalsDs patsBinders $ dsLocalBinds binds e) 
+                                 match_result1
 		-- NB: nested dsLet inside matchResult
     in
     returnDs match_result2
+        where bindsBinders = map unLoc (collectLocalBinders binds)
+              patsBinders  = collectPatsBinders (map (L undefined) pats) 
 
 dsGRHS hs_ctx pats rhs_ty (L loc (GRHS guards rhs))
-  = matchGuards (map unLoc guards) hs_ctx rhs rhs_ty
+  = do rhs' <- maybeInsertBreakpoint rhs rhs_ty
+       matchGuards (map unLoc guards) hs_ctx rhs' rhs_ty
 \end{code}
 
 
@@ -94,7 +103,7 @@ matchGuards [] ctx rhs rhs_ty
 	-- you don't get a "non-exhaustive eqns" message when the guards 
 	-- finish in "otherwise".
 	-- NB:	The success of this clause depends on the typechecker not
-	-- 	wrapping the 'otherwise' in empty HsTyApp or HsCoerce constructors
+	-- 	wrapping the 'otherwise' in empty HsTyApp or HsWrap constructors
 	--	If it does, you'll get bogus overlap warnings
 matchGuards (ExprStmt (L _ (HsVar v)) _ _ : stmts) ctx rhs rhs_ty
   |  v `hasKey` otherwiseIdKey
@@ -108,7 +117,8 @@ matchGuards (ExprStmt expr _ _ : stmts) ctx rhs rhs_ty
     returnDs (mkGuardedMatchResult pred_expr match_result)
 
 matchGuards (LetStmt binds : stmts) ctx rhs rhs_ty
-  = matchGuards stmts ctx rhs rhs_ty	`thenDs` \ match_result ->
+  = bindLocalsDs (map unLoc $ collectLocalBinders binds) $
+    matchGuards stmts ctx rhs rhs_ty	`thenDs` \ match_result ->
     returnDs (adjustMatchResultDs (dsLocalBinds binds) match_result)
 	-- NB the dsLet occurs inside the match_result
 	-- Reason: dsLet takes the body expression as its argument
@@ -116,7 +126,8 @@ matchGuards (LetStmt binds : stmts) ctx rhs rhs_ty
 	--	   body expression in hand
 
 matchGuards (BindStmt pat bind_rhs _ _ : stmts) ctx rhs rhs_ty
-  = matchGuards stmts ctx rhs rhs_ty	`thenDs` \ match_result ->
+  = bindLocalsDs (collectPatBinders pat) $
+    matchGuards stmts ctx rhs rhs_ty	`thenDs` \ match_result ->
     dsLExpr bind_rhs			`thenDs` \ core_rhs ->
     matchSinglePat core_rhs ctx pat rhs_ty match_result
 \end{code}