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(* File reduced by coq-bug-finder from original input, then from 1829 lines to 37 lines, then from 47 lines to 18 lines *)
Class Contr_internal (A : Type) :=
BuildContr { center : A ;
contr : (forall y : A, True) }.
Class Contr A := Contr_is_contr : Contr_internal A.
Inductive Unit : Set := tt.
Instance contr_unit : Contr Unit | 0 :=
let x := {|
center := tt;
contr := fun t : Unit => I
|} in x. (* success *)
Fail Instance contr_unit' : Contr Unit | 0 :=
{|
center := tt;
contr := fun t : Unit => I
|}.
(* Error: Mismatched contexts while declaring instance:
Expected: (Contr_is_contr : Contr_internal _UNBOUND_REL_1)
Found: tt (fun t : Unit => I) *)
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