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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.
5 lines
114 B
Plaintext
5 lines
114 B
Plaintext
Pair.fst
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: ∀(A: *) ∀(B: *) ∀(p: (Pair A B)) A
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= λA λB λp use P = λx A
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use new = λa λb a
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(~p P new) |