A means of expressing certain ef="module.php?name=Lexikon&file=search&eid=1&query=higher-order function">higher-order functions in a first order language. Proposed by Phil Wadler. Higher-order macros cannot be recursive at the top level but they may contain recursive definitions. e.g. map f l = m l where m [] = [] m (x:xs) = f x : m xs expanding a call to this macro is equivalent to specialising a call to map in its first argument. See ef="module.php?name=Lexikon&file=search&eid=1&query=partial evaluation">partial evaluation.

e="border-width:thin; border-color:#333333; border-style:dashed; padding:5px;" align="left">In addition suitable contents:
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