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+(* About binders which remain unnamed after typing *)
+
+Global Set Asymmetric Patterns.
+
+Definition proj2_sig_map {A} {P Q : A -> Prop} (f : forall a, P a -> Q a) (x :
+@sig A P) : @sig A Q
+  := let 'exist a p := x in exist Q a (f a p).
+Axioms (feBW' : Type) (g : Prop -> Prop) (f' : feBW' -> Prop).
+Definition foo := @proj2_sig_map feBW' (fun  H  => True = f' _) (fun H =>
+ g True = g (f' H))
+                                 (fun (a : feBW') (p : (fun H : feBW' => True =
+ f' H) a) => @f_equal Prop Prop g True (f' a) p).
+Print foo.
+Goal True.
+  lazymatch type of foo with
+  | sig (fun a : ?A => ?P) -> _
+    => pose (fun a : A => a = a /\ P = P)
+  end.