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diff --git a/test-suite/bugs/closed/bug_9058.v b/test-suite/bugs/closed/bug_9058.v
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index 0000000000..6de8324641
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+++ b/test-suite/bugs/closed/bug_9058.v
@@ -0,0 +1,16 @@
+Class A (X : Type) := {}.
+Hint Mode A ! : typeclass_instances.
+
+Class B X {aX: A X} Y := { opB: X -> Y -> Y }.
+Hint Mode B - - ! : typeclass_instances.
+
+Section Section.
+
+Context X {aX: A X} Y {bY: B X Y}.
+
+(* Set Typeclasses Debug. *)
+
+Let ok := fun (x : X) (y : Y) => opB x y.
+Let ok' := fun x (y : Y) => opB x y.
+
+End Section.