27 lines
778 B
Plaintext
27 lines
778 B
Plaintext
def0 Unit : ★ = {tt}
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def drop-unit : 0.(A : ★) → Unit → A → A =
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λ A u x ⇒ case u return A of {'tt ⇒ x}
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def0 IO : ★ → ★ = λ A ⇒ IOState → A × IOState
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def bind : 0.(A B : ★) → IO A → (A → IO B) → IO B =
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λ A B m k s0 ⇒
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case m s0 return B × IOState of { (x, s1) ⇒ k x s1 }
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def seq : IO Unit → IO Unit → IO Unit =
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λ a b ⇒ bind Unit Unit a (λ u ⇒ drop-unit (IO Unit) u b)
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#[compile-scheme "(lambda (n) (builtin-io (printf \"~d~n\" n) 'tt))"]
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postulate print-ℕ : ℕ → IO Unit
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#[compile-scheme "(lambda (s) (builtin-io (printf \"~s~n\" s) 'tt))"]
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postulate print : String → IO Unit
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load "nat.quox"
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#[main]
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def main : IO Unit =
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let1 sixty-nine = nat.plus 60 9 in
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seq (print-ℕ sixty-nine) (print "(nice)")
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