* guix/records.scm (alist->record): Add `multiple-value-keys' parameter. Update docstring, and honor it. * tests/records.scm ("alist->record"): New record.
* guix/records.scm (%recutils-comment-rx): New variable. (recutils->alist): Match comments. * tests/records.scm ("recutils->alist"): Add comments.
* guix/records.scm (%recutils-field-rx): New variable. (recutils->alist): New procedure, formerly known as `fields->alist'. * guix/scripts/substitute-binary.scm (fields->alist): Use it. * tests/records.scm ("recutils->alist"): New test.
* guix/utils.scm (define-record-type*): Move to... * guix/records.scm: ... here. New file. * guix/build-system.scm, guix/packages.scm: Use it. * guix/gnu-maintenance.scm: Likewise. (official-gnu-packages)[alist->record]: Remove. * guix/scripts/substitute-binary.scm: Likewise. (alist->record, object->fields): Remove. * tests/utils.scm ("define-record-type*", "define-record-type* with letrec* behavior", "define-record-type* & inherit", "define-record-type* & inherit & letrec* behavior", "define-record-type* & thunked", "define-record-type* & thunked & default", "define-record-type* & thunked & inherited"): Move to... * tests/records.scm: ... here. New file.
