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+Set Primitive Projections.
+Record Foo := { bar : Set }.
+Class Baz (F : Foo) := { qux : F.(bar) }.
+Coercion qux : Baz >-> bar.
+
+Definition f : Foo := {| bar := nat |}.
+Canonical Structure f.
+Check (fun b : Baz f => b : _.(bar)).
+
+(* Error: Found target class bar instead of bar. *)