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-rw-r--r--compiler/GHC/Core/Type.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/GHC/Core/Type.hs b/compiler/GHC/Core/Type.hs
index 86f483abca..796fb5aecd 100644
--- a/compiler/GHC/Core/Type.hs
+++ b/compiler/GHC/Core/Type.hs
@@ -1505,7 +1505,7 @@ piResultTys ty orig_args@(arg:args)
-- c.f. #15473
pprPanic "piResultTys2" (ppr ty $$ ppr orig_args $$ ppr all_args)
-applyTysX :: [TyVar] -> Type -> [Type] -> Type
+applyTysX :: HasDebugCallStack => [TyVar] -> Type -> [Type] -> Type
-- applyTysX beta-reduces (/\tvs. body_ty) arg_tys
-- Assumes that (/\tvs. body_ty) is closed
applyTysX tvs body_ty arg_tys