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Reference.org
Higher-order abstract syntax
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<p>In <a href="/facts/Computer_science/lN3pEyPz">computer science</a>, higher-order abstract syntax (abbreviated HOAS) is a technique for the representation of <a href="/facts/Abstract_syntax_tree/73AUK1jI">abstract syntax trees</a> for languages with variable <a href="/facts/Name_binding/HbBx9mpM">binders</a>. </p>