Fix typo that prevented zonking of rhs of EqInsts

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

diff --git a/compiler/typecheck/Inst.lhs b/compiler/typecheck/Inst.lhs
index 9c152e1..66e72e4 100644 (file)
--- a/compiler/typecheck/Inst.lhs
+++ b/compiler/typecheck/Inst.lhs
@@ -99,6 +99,8 @@ import Outputable
 import Data.List
 import TypeRep
 import Class
+
+import Control.Monad ( liftM )
 \end{code}
 
 
@@ -555,11 +557,11 @@ zonkInst implic@(ImplicInst {})
 
 zonkInst eqinst@(EqInst {tci_left = ty1, tci_right = ty2})
   = do { co' <- eitherEqInst eqinst 
-                       (\covar -> return (mkWantedCo covar)) 
-                       (\co    -> zonkTcType co >>= \coercion -> return (mkGivenCo coercion))
+                 (\covar -> return (mkWantedCo covar)) 
+                 (\co    -> liftM mkGivenCo $ zonkTcType co)
        ; ty1' <- zonkTcType ty1
        ; ty2' <- zonkTcType ty2
-       ; return (eqinst {tci_co = co',tci_left=ty1',tci_right=ty2})
+       ; return (eqinst {tci_co = co', tci_left= ty1', tci_right = ty2' })
        }
 
 zonkInsts insts = mappM zonkInst insts
@@ -776,7 +778,7 @@ lookupSimpleInst (Method {tci_oid = id, tci_tys = tys, tci_theta = theta, tci_lo
 -- [Same shortcut as in newOverloadedLit, but we
 --  may have done some unification by now]             
 
-lookupSimpleInst (LitInst {tci_lit = HsIntegral i from_integer_name, tci_ty = ty, tci_loc = loc})
+lookupSimpleInst (LitInst {tci_lit = HsIntegral i from_integer_name _, tci_ty = ty, tci_loc = loc})
   | Just expr <- shortCutIntLit i ty
   = returnM (GenInst [] (noLoc expr))
   | otherwise
@@ -788,7 +790,7 @@ lookupSimpleInst (LitInst {tci_lit = HsIntegral i from_integer_name, tci_ty = ty
                     (mkHsApp (L (instLocSpan loc)
                                 (HsVar (instToId method_inst))) integer_lit))
 
-lookupSimpleInst (LitInst {tci_lit = HsFractional f from_rat_name, tci_ty = ty, tci_loc = loc})
+lookupSimpleInst (LitInst {tci_lit = HsFractional f from_rat_name _, tci_ty = ty, tci_loc = loc})
   | Just expr <- shortCutFracLit f ty
   = returnM (GenInst [] (noLoc expr))
 
@@ -800,7 +802,7 @@ lookupSimpleInst (LitInst {tci_lit = HsFractional f from_rat_name, tci_ty = ty,
     returnM (GenInst [method_inst] (mkHsApp (L (instLocSpan loc) 
                                               (HsVar (instToId method_inst))) rat_lit))
 
-lookupSimpleInst (LitInst {tci_lit = HsIsString s from_string_name, tci_ty = ty, tci_loc = loc})
+lookupSimpleInst (LitInst {tci_lit = HsIsString s from_string_name _, tci_ty = ty, tci_loc = loc})
   | Just expr <- shortCutStringLit s ty
   = returnM (GenInst [] (noLoc expr))
   | otherwise