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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.
12 lines
312 B
Plaintext
12 lines
312 B
Plaintext
List.begin
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: ∀(A: *) ∀(list: (List A)) (List A)
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= λA λlist
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use P = λx (List A)
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use cons = λx0 λxs
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use P = λx (List A)
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use cons = λx1 λxs
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(List.cons A x0 (List.begin A (List.cons A x1 xs)))
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use nil = (List.nil A)
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(~xs P cons nil)
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use nil = (List.nil A)
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(~list P cons nil) |