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85ad65b026
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.
27 lines
525 B
Plaintext
27 lines
525 B
Plaintext
Parser.variant
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: ∀(A: *) ∀(variants: (List (Parser.Guard A)))
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(Parser A)
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= λA λvariants
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use P = λx (Parser A)
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use cons = λvariant λothers
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(Pair.get
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(Parser Bool)
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(Parser A)
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variant
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(Parser A)
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λguard λparser
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(Parser.bind
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Bool
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A
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guard
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λsuccess
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(Bool.if
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success
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(Parser A)
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parser
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(Parser.variant A others)
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)
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)
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)
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use nil = (Parser.fail A "error")
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(~variants P cons nil) |