X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcInstDcls.lhs;h=fe7b1d8b24254915b5335c724569cf62a4f874e7;hp=0be77242e3e7f6bc29beabc1d8e319b96c8e42cb;hb=84923cc7de2a93c22a2f72daf9ac863959efae13;hpb=3ded6e65b730c2b5eb9a9519448bbcd905c5d7fa

diff --git a/compiler/typecheck/TcInstDcls.lhs b/compiler/typecheck/TcInstDcls.lhs
index 0be7724..fe7b1d8 100644
--- a/compiler/typecheck/TcInstDcls.lhs
+++ b/compiler/typecheck/TcInstDcls.lhs
@@ -240,11 +240,7 @@ tcLocalInstDecl1 decl@(L loc (InstDecl poly_ty binds uprags ats))
 	; checkTc (not is_boot || (isEmptyLHsBinds binds && null uprags))
 		  badBootDeclErr
 
-	-- Typecheck the instance type itself.  We can't use 
-	-- tcHsSigType, because it's not a valid user type.
-	; kinded_ty <- kcHsSigType poly_ty
-	; poly_ty'  <- tcHsKindedType kinded_ty
-	; let (tyvars, theta, tau) = tcSplitSigmaTy poly_ty'
+	; (tyvars, theta, tau) <- tcHsInstHead poly_ty
 	
 	-- Next, process any associated types.
 	; idx_tycons <- mappM tcIdxTyInstDecl ats