Type subtraction also as nat->int->int and int->nat->int
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@ -318,9 +318,8 @@ module Typer = struct
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| Some t -> ok t
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let sub = typer_2 "SUB" @@ fun a b ->
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if (eq_2 (a , b) (t_int ()))
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then ok @@ t_int () else
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if (eq_2 (a , b) (t_nat ()))
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if (eq_1 a (t_int ()) || eq_1 a (t_nat ()))
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&& (eq_1 b (t_int ()) || eq_1 b (t_nat ()))
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then ok @@ t_int () else
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if (eq_2 (a , b) (t_timestamp ()))
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then ok @@ t_int () else
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