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Require Import ssrmatching.
(*Set Debug SsrMatching.*)
Tactic Notation "at" "[" ssrpatternarg(pat) "]" tactic(t) :=
let name := fresh in
let def_name := fresh in
ssrpattern pat;
intro name;
pose proof (refl_equal name) as def_name;
unfold name at 1 in def_name;
t def_name;
[ rewrite <- def_name | idtac.. ];
clear name def_name.
Lemma test (H : True -> True -> 3 = 7) : 28 = 3 * 4.
Proof.
at [ X in X * 4 ] ltac:(fun place => rewrite -> H in place).
- reflexivity.
- trivial.
- trivial.
Qed.
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