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diff --git a/testsuite/tests/partial-sigs/should_compile/T16762d.hs b/testsuite/tests/partial-sigs/should_compile/T16762d.hs
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+++ b/testsuite/tests/partial-sigs/should_compile/T16762d.hs
@@ -0,0 +1,14 @@
+{-# LANGUAGE TypeFamilies, PolyKinds, ExplicitForAll #-}
+
+module Foo where
+
+import Data.Kind
+import Data.Proxy
+
+
+type family F (a::k) (b::k)
+
+-- Tricky because we can't quantify the '_' variable outside.
+-- See Note [Generalising in tcTyFamInstEqnGuts] in TyCl
+
+type instance forall k (x::k). F x _  = Int