Full Abstraction for the Second-Order Subset of an Algol-like Language
We present a denotational semantics for an Algol-like language, Alg, which is fully abstract for the second-order subset. This constitutes the first significant full-abstraction result for a block-structured language with local variables. As all the published ‘test equivalences’ [MS88, Len93, 0T95] for Algol-like languages are contained in the second-order subset, they can all be validated (easily) in our denotational model.
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