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records: Let thunked fields refer to their inherited value.

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* guix/records.scm (make-syntactic-constructor)[field-index]: New procedure.
[wrap-field-value]: Add optional argument ‘parent’.  When it is true, bind F
to the inherited field value.
[field-bindings/inheritance]: New procedure.
Use it.
* tests/records.scm ("define-record-type* & thunked & no inherited value")
("define-record-type* & thunked & inherited value")
("define-record-type* & thunked & inherited value & this-record"): New tests.
* doc/guix.texi (Defining Package Variants): Update ‘modify-inputs’ example to
refer to ‘inputs’.
(Writing Manifests): Likewise.
* doc/guix-cookbook.texi (Package Variants): Likewise for
‘substitute-keyword-arguments’.

Fixes: https://issues.guix.gnu.org/50335
Change-Id: If4e18155ce203637ff9e116ee8098f8997bfebe2
This commit is contained in:
Ludovic Courtès
2026-03-06 18:46:35 +01:00
parent e1457c4679
commit a7c8e68dc5
4 changed files with 131 additions and 19 deletions
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13
doc/guix.texi
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@@ -8800,14 +8800,15 @@ dependency like so:
(define gdb-sans-guile
(package
(inherit gdb)
(inputs (modify-inputs (package-inputs gdb)
(inputs (modify-inputs inputs
(delete "guile")))))
@end lisp
The @code{modify-inputs} form above removes the @code{"guile"} package
from the @code{inputs} field of @code{gdb}. The @code{modify-inputs}
macro is a helper that can prove useful anytime you want to remove, add,
or replace package inputs.
In the body of the @code{inputs} field above, @code{inputs} is bound to
the inherited value. Thus, the @code{modify-inputs} form above removes
the @code{"guile"} package from the @code{inputs} field of @code{gdb}.
The @code{modify-inputs} macro is a helper that can prove useful anytime
you want to remove, add, or replace package inputs.
@defmac modify-inputs inputs clauses
Modify the given package inputs, as returned by @code{package-inputs} & co.,
@@ -9131,7 +9132,7 @@ these lines:
(define gdb-sans-guile
(package
(inherit gdb)
(inputs (modify-inputs (package-inputs gdb)
(inputs (modify-inputs inputs
(delete "guile")))))
;; Return a manifest containing that one package plus Git.