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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.
8 lines
222 B
Plaintext
8 lines
222 B
Plaintext
List.app
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: ∀(A: *) ∀(B: *) ∀(f: ∀(x: A) B) ∀(x: (List A))
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(List B)
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= λA λB λf λx
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use P = λx (List B)
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use cons = λh λt (List.cons B (f h) (List.app A B f t))
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use nil = (List.nil B)
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(~x P cons nil) |