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+From mathcomp Require Import ssreflect ssrfun ssrbool ssrnat.
+
+Set Implicit Arguments.
+Unset Strict Implicit.
+Unset Printing Implicit Defensive.
+
+Lemma test_dup1 : forall n : nat, odd n.
+Proof. move=> /[dup] m n; suff: odd n by []. Abort.
+
+Lemma test_dup2 : let n := 1 in False.
+Proof. move=> /[dup] m n; have : m = n := erefl. Abort.
+
+Lemma test_swap1 : forall (n : nat) (b : bool), odd n = b.
+Proof. move=> /[swap] b n; suff: odd n = b by []. Abort.
+
+Lemma test_swap1 : let n := 1 in let b := true in False.
+Proof. move=> /[swap] b n; have : odd n = b := erefl. Abort.
+
+Lemma test_apply A B : forall (f : A -> B) (a : A), False.
+Proof.
+move=> /[apply] b.
+Check (b : B).
+Abort.