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(* Was solved at some time, suspectingly in PR #6328 *)
Goal exists n, n > 1.
Proof.
unshelve eexists. (*2 goals, as expected*)
Undo.
unshelve (eexists; instantiate (1:=ltac:(idtac))). (*only 1 goal*)
shelve.
Undo.
2:unshelve instantiate (1:=_).
Abort.
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