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Erschienen in:
2008 | OriginalPaper | Buchkapitel
A Theory of Hygienic Macros
verfasst von : David Herman, Mitchell Wand
Erschienen in: Programming Languages and Systems
Verlag: Springer Berlin Heidelberg
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Hygienic macro systems, such as Scheme’s, automatically rename variables to prevent unintentional variable capture—in short, they “just work.” Yet hygiene has never been formally presented as a
specification
rather than an algorithm. According to folklore, the definition of hygienic macro expansion hinges on the preservation of alpha-equivalence. But the only known notion of alpha-equivalence for programs with macros depends on the results of macro expansion! We break this circularity by introducing explicit binding specifications into the syntax of macro definitions, permitting a definition of alpha-equivalence independent of expansion. We define a semantics for a first-order subset of Scheme-like macros and prove hygiene as a consequence of confluence.