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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.
7 lines
176 B
Plaintext
7 lines
176 B
Plaintext
List.length
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: ∀(A: *) ∀(a: (List A)) Nat
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= λA λa
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use P = λx Nat
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use cons = λa.head λa.tail (Nat.succ (List.length A a.tail))
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use nil = Nat.zero
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(~a P cons nil) |