TOKEN
Tokens all have the same kind, except for literal tokens, which are parametrically typed by the type of value they contain. They are produced by a LexicalScanner and are consumed by the AvailCompiler.
Properties
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An array of A_Types, where the entries correspond to ordinals of other Types, and hold the intersection of that type and the current type.
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A boolean array where the entries correspond to ordinals of other Types. They are true precisely when the type with that ordinal is a supertype of the current type.
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An array of A_Types, where the entries correspond to ordinals of other Types, and hold the unions of that type and the current type.