File: bug_4120.v

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coq 8.20.1%2Bdfsg-1
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Definition id {T} (x : T) := x.
Goal sigT (fun x => id x)%type.
  change (fun x => ?f x) with f.
  exists Type. exact Set.
Defined. (* Error: Attempt to save a proof with shelved goals (in proof Unnamed_thm) *)