19 lines
582 B
Lua
19 lines
582 B
Lua
local env = environment()
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local nat = Const("nat")
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local int = Const("int")
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env = add_inductive(env,
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"nat", Type,
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"zero", nat,
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"succ", mk_arrow(nat, nat))
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env = add_inductive(env,
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"int", Type,
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"pos", mk_arrow(nat, int),
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"neg", mk_arrow(nat, int))
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function display_type(env, t)
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print(tostring(t) .. " : " .. tostring(type_checker(env):check(t)))
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end
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display_type(env, Const({"nat", "rec"}, {0}))
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display_type(env, Const({"int", "rec"}, {0}))
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