lean2/tests/lean/run/505.lean

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import data.set
open set
section
variable {A : Type}
definition set_of (P : A → Prop) : set A := P
notation `{` binders `|` r:(scoped:1 P, set_of P) `}` := r
definition insert (a : A) (s : set A) : set A := {x : A | x = a x ∈ s}
notation `⦃` s:(foldr `,` (a t, insert a t) ∅) `⦄` := s
notation `{` `{` s:(foldr `,` (a t, insert a t) ∅) `}` `}` := s
check ⦃1, 2, 3⦄
check {{1, 2, 3}}
definition foo {X : Type} {{ x : X }} : X := x
end