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Require Import String.
Local Ltac set_strings :=
let s := match goal with |- context[String ?s1 ?s2] => constr:(String s1 s2) end in
let H := fresh s in
set (H := s).
Local Open Scope string_scope.
Goal "asdf" = "bds".
Fail set_strings. (* Error: Ltac variable s is bound to "asdf" which cannot be coerced to
a fresh identifier. *)
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