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Now, there are two local binders: let x = ... use x = ... The 'let' binder will create a local definition, type-check it, and assign a name to it. When compiled, it will create 'dup' nodes. The 'use' binder is just an alias. It will not bind a new variable, and, when compiled, will create inline copies. Also, for type-checking, it allows creating aliases that are definitionaly equal for the checker.
20 lines
437 B
Plaintext
20 lines
437 B
Plaintext
Parser.repeat
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: ∀(n: Nat) ∀(A: *) ∀(p: (Parser A))
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(Parser (List A))
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= λn λA λp
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use P = λx (Parser (List A))
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use succ = λn.pred
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(Parser.bind
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A
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(List A)
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p
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λhead
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(Parser.bind
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(List A)
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(List A)
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(Parser.repeat n.pred A p)
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λtail (Parser.pure (List A) (List.cons A head tail))
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)
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)
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use zero = (Parser.pure (List A) (List.nil A))
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(~n P succ zero) |