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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.
17 lines
436 B
Plaintext
17 lines
436 B
Plaintext
BBT.new_node
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: ∀(K: *)
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∀(V: *)
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∀(key: K)
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∀(val: V)
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∀(lft: (BBT K V))
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∀(rgt: (BBT K V))
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(BBT K V)
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= λK λV λkey λval λlft λrgt
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use P = λx (BBT K V)
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use new = λlft.size λlft
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use P = λx (BBT K V)
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use new = λrgt.size λrgt
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use new_size = #(+ #1 (U60.max rgt.size lft.size))
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(BBT.bin K V new_size key val lft rgt)
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(~(BBT.got_size K V rgt) P new)
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(~(BBT.got_size K V lft) P new) |