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Hygienic macro

In computer science, hygienic macros are macros whose expansion is guaranteed not to cause the accidental capture of identifiers. They are a feature of programming languages such as Scheme, Dylan, Rust, Nim, and Julia. The general problem of accidental capture was well known in the Lisp community before the introduction of hygienic macros. Macro writers…

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Implementations

WandPattern matchingR6RSRacketNemerle
11 related topics

The hygiene problem

C preprocessorShadowedScopeCommon Lisp
4 related topics

Strategies used in languages that lack hygienic macros

MacLispElispUndefined behavior
3 related topics

Overview

Computer scienceMacrosCaptureIdentifiersProgramming languages
11 related topics

Topics to explore

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Overview

The hygiene problem

Strategies used in languages that lack hygienic macros

Hygienic transformation

Implementations

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Map overview Semantic statistics

Hygienic macro

Nodes36
Edges35
Triples57
Avg. degree1.94
Density0.055556
Components1

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Hygienic macro

Top relations

related to Implementations · 16
Hygienic macro → At, Bawden, Dybvig, In, KFFD, Kohlbecker, Macro, R5RS, Rees, Scheme, Shortly, Syntactic, The, Thesyntax-casesystem, Unlike, Wand
related to Temporary symbol creation · 10
Hygienic macro → Although, Common Lisp, Elisp, However, In, Lisp-like, MacLisp, Similar, The, This
related to Hygienic transformation · 6
Hygienic macro → For, Hygienic, In, Scheme, Scheme'slet-syntaxanddefine-syntaxmacro, This
related to References · 5
Hygienic macro → Hygienic Macros, On Lisp, Paul Grahamsyntax-rules, Scheme, Syntax-Case
related to Languages with hygienic macro systems · 4
Hygienic macro → ALGOL, NemerleDylanElixirNimRustHaxeMary2, Racket, Scheme
related to Criticism · 3
Hygienic macro → Doug Hoyte, Hygienic, Let Over Lambda
related to Variable shadowing · 2
Hygienic macro → In, Running

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Important terminology

macro macros hygienic scheme hygiene problem capture symbol systems used lisp system standard syntax-rules use language expansion variable syntax-case languages

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Schemeinstance ofThey are a feature of programming languages0.80text
Dylaninstance ofThey are a feature of programming languages0.80text
Rustinstance ofThey are a feature of programming languages0.80text
Niminstance ofThey are a feature of programming languages0.80text
and Juliainstance ofThey are a feature of programming languages0.80text
in Common Lispinstance ofsimilar togensym.PackagesUsing packages0.80text
the macro simply uses a private symbol from the package in which the macro is definedinstance ofsimilar togensym.PackagesUsing packages0.80text
in Common Lispinstance ofPackagesUsing packages0.80text
the macro simply uses a private symbol from the package in which the macro is definedinstance ofPackagesUsing packages0.80text
Scheme use a macro expansion process that preserves the lexical scoping of all identifiersinstance ofHygienic transformationHygienic macro systems in languages0.80text
prevents accidental captureinstance ofHygienic transformationHygienic macro systems in languages0.80text
Hygienic macrorelated to CriticismHygienic0.60section

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