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Add documentation for else, =>, _, ... aux syntax

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* doc/ref/api-macros.texi (Syntax Rules): Document aux syntax.
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Andy Wingo 2019-09-19 15:24:14 +02:00
parent 374c1e5807
commit 462782af86
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doc/ref/api-macros.texi
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@ -248,6 +248,26 @@ lawyers probably see the need here for use of @code{literal-identifier=?} rather
than @code{free-identifier=?}, and would probably be correct. Patches than @code{free-identifier=?}, and would probably be correct. Patches
accepted.}. accepted.}.
@cindex auxiliary syntax
@cindex syntax, auxiliary
Although literals can be unbound, usually they are bound to allow them
to be imported, exported, and renamed. @xref{Modules}, for more
information on imports and exports. In Guile there are a few standard
auxiliary syntax definitions, as specified by R6RS and R7RS:
@deffn {Scheme Syntax} else
@deffnx {Scheme Syntax} =>
@deffnx {Scheme Syntax} _
@deffnx {Scheme Syntax} ...
Auxiliary syntax definitions.
These are defined as if with a macro that never matches, e.g.:
@example
(define-syntax else (syntax-rules ()))
@end example
@end deffn
If a pattern is not a list, vector, or an identifier, it matches as a literal, If a pattern is not a list, vector, or an identifier, it matches as a literal,
with @code{equal?}. with @code{equal?}.