lean2/tests/lean/t6.lean

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section
{parameter} A : Type -- Mark A as implicit parameter
parameter R : A → A → Bool
definition id (a : A) : A := a
definition refl : Bool := forall (a : A), R a a
definition symm : Bool := forall (a b : A), R a b -> R b a
end
check id.{2}
check refl.{1}
check symm.{1}