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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.
11 lines
391 B
Plaintext
11 lines
391 B
Plaintext
String.unpar
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: ∀(fst: Char) ∀(lst: Char) ∀(str: String) String
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= λfst λlst λstr
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use P = λx String
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use cons = λhead λtail
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use P = λx ∀(head: Char) ∀(tail: String) String
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use true = λhead λtail (String.begin tail)
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use false = λhead λtail (String.cons head tail)
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(~(Char.equal head fst) P true false head tail)
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use nil = String.nil
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(~str P cons nil) |