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Make mkDFunUnfolding more robust
[ghc-hetmet.git]
/
compiler
/
typecheck
/
TcInstDcls.lhs
diff --git
a/compiler/typecheck/TcInstDcls.lhs
b/compiler/typecheck/TcInstDcls.lhs
index
f4e338d
..
f84f3d5
100644
(file)
--- a/
compiler/typecheck/TcInstDcls.lhs
+++ b/
compiler/typecheck/TcInstDcls.lhs
@@
-1249,7
+1249,7
@@
instDeclCtxt2 :: Type -> SDoc
instDeclCtxt2 dfun_ty
= inst_decl_ctxt (ppr (mkClassPred cls tys))
where
instDeclCtxt2 dfun_ty
= inst_decl_ctxt (ppr (mkClassPred cls tys))
where
- (_,cls,tys) = tcSplitDFunTy dfun_ty
+ (_,_,cls,tys) = tcSplitDFunTy dfun_ty
inst_decl_ctxt :: SDoc -> SDoc
inst_decl_ctxt doc = ptext (sLit "In the instance declaration for") <+> quotes doc
inst_decl_ctxt :: SDoc -> SDoc
inst_decl_ctxt doc = ptext (sLit "In the instance declaration for") <+> quotes doc