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Rob Rix 2015-10-16 16:10:10 -04:00
parent f4e462eba2
commit 841f7017c8
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prototype/Doubt/Cofree.swift
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@ -4,7 +4,7 @@
/// ///
/// This type is dual to `Free`. Where `Free` is inhabited by syntax trees where some terms are replaced with `B`s, `Cofree` is inhabited by syntax trees where all terms are annotated with `B`s. In Doubt, this allows us to e.g. annotate terms with source range information, categorization, etc. /// This type is dual to `Free`. Where `Free` is inhabited by syntax trees where some terms are replaced with `B`s, `Cofree` is inhabited by syntax trees where all terms are annotated with `B`s. In Doubt, this allows us to e.g. annotate terms with source range information, categorization, etc.
public enum Cofree<A, B> { public enum Cofree<A, B> {
case Unroll(B, Memo<Syntax<Cofree, A>>) indirect case Unroll(B, Memo<Syntax<Cofree, A>>)
public var unwrap: Syntax<Cofree, A> { public var unwrap: Syntax<Cofree, A> {
switch self { switch self {