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doc: Recommend 'match-record'.

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* doc/contributing.texi (Data Types and Pattern Matching): Recommend
'match-record'.
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Ludovic Courtès 2022-11-19 22:40:35 +01:00
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doc/contributing.texi
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@ -1089,11 +1089,16 @@ and then to browse them ``by hand'' using @code{car}, @code{cdr},
notably the fact that it is hard to read, error-prone, and a hindrance
to proper type error reports.
@findex define-record-type*
@findex match-record
@cindex pattern matching
Guix code should define appropriate data types (for instance, using
@code{define-record-type*}) rather than abuse lists. In addition, it
should use pattern matching, via Guile’s @code{(ice-9 match)} module,
especially when matching lists (@pxref{Pattern Matching,,, guile, GNU
Guile Reference Manual}).
Guile Reference Manual}); pattern matching for records is better done
using @code{match-record} from @code{(guix records)}, which, unlike
@code{match}, verifies field names at macro-expansion time.
@node Formatting Code
@subsection Formatting Code