lean2/tests/lean/push.lean

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Variable first : Bool
Push
Variables a b c : Int
Variable f : Int -> Int
Eval f a
Pop
Eval f a (* should produce an error *)
Show Environment 1
Push
Infixl 100 ++ : Int::add
Check 10 ++ 20
Pop
Check 10 ++ 20 (* should produce an error *)
Pop (* should produce an error *)