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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.
19 lines
555 B
Plaintext
19 lines
555 B
Plaintext
String.equal
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: ∀(a: String) ∀(b: String) Bool
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= λa λb
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use P = λx ∀(b: String) Bool
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use cons = λa.head λa.tail λb
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use P = λx ∀(a.head: Char) ∀(a.tail: String) Bool
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use cons = λb.head λb.tail λa.head λa.tail
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(Bool.and
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(U60.equal a.head b.head)
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(String.equal a.tail b.tail)
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)
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use nil = λa.head λa.tail Bool.false
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(~b P cons nil a.head a.tail)
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use nil = λb
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use P = λx Bool
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use cons = λb.head λb.tail Bool.false
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use nil = Bool.true
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(~b P cons nil)
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(~a P cons nil b) |