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Require Import ssreflect.
Axiom v1 : nat -> bool.
Section Foo.
Variable v2 : nat -> bool.
Lemma test (v3 : nat -> bool) (v4 : bool -> bool) (v5 : bool -> bool) : nat -> nat -> nat -> nat -> True.
Proof.
Set Debug Ssreflect.
move=> {}/v1 b1 {}/v2 b2 {}/v3 b3 {}/v2/v4/v5 b4.
Check b1 : bool.
Check b2 : bool.
Check b3 : bool.
Check b4 : bool.
Fail Check v3.
Fail Check v4.
Fail Check v5.
Check v2 : nat -> bool.
by [].
Qed.
Lemma test2 (v : True <-> False) : True -> False.
Proof.
move=> {}/v.
Fail Check v.
by [].
Qed.
End Foo.
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