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diff --git a/test-suite/bugs/closed/3495.v b/test-suite/bugs/closed/3495.v
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+Require Import RelationClasses.
+
+Axiom R : Prop -> Prop -> Prop.
+Declare Instance : Reflexive R.
+
+Class bar := { x : False }.
+Record foo := { a : Prop ; b : bar }.
+
+Definition default_foo (a0 : Prop) `{b : bar} : foo := {| a := a0 ; b := b |}.
+
+Goal exists k, R k True.
+Proof.
+eexists.
+evar (b : bar).
+let e := match goal with |- R ?e _ => constr:(e) end in
+unify e (a (default_foo True)).
+subst b.
+reflexivity.