27 lines
474 B
Text
27 lines
474 B
Text
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precedence `+`:65
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namespace nat
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variable nat : Type.{1}
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variable add : nat → nat → nat
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infixl + := add
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end
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namespace int
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using nat (nat)
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variable int : Type.{1}
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variable add : int → int → int
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infixl + := add
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variable of_nat : nat → int
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namespace coercions
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coercion of_nat
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end
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end
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using nat
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using int
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variables n m : nat
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check n+m -- coercion nat -> int is not available
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using int.coercions
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check n+m -- coercion nat -> int is available
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