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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
240 B
Plaintext
7 lines
240 B
Plaintext
List.fold
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: ∀(T: *) ∀(list: (List T)) (List.Folder T)
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= λT λlist λP λcons λnil
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use fold_P = λxs P
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use fold_cons = λhead λtail (cons head (List.fold T tail P cons nil))
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use fold_nil = nil
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(~list fold_P fold_cons fold_nil) |