* guix/records.scm (define-record-type*)[make-syntactic-constructor]:
Turn THUNKED and DEFAULTS into keyword arguments.
Adjust caller accordingly. Declare 'thunked' and 'defaults' local
variables.
* guix/records.scm (%recutils-field-rx, %recutils-comment-rx,
%recutils-plus-rx): Remove.
(%recutils-field-charset): New variable.
(recutils->alist): Adjust to use tests (string-ref line 0) instead of
regexps.
* guix/records.scm (define-record-type*)[record-inheritance]: Check for
unexpected field names.
* tests/records.scm ("define-record-type* with let* behavior"): Return
#t, not *unspecified*.
("define-record-type* & inherit & extra initializers"): New test.
* guix/records.scm (define-record-type*): Wrap field bindings in a
'let*', not in a 'letrec*', which turned out to be pointlessly
inconvenient.
* tests/records.scm: Adjust test names accordingly.
* guix/records.scm (%recutils-plus-rx): New variable.
(recutils->alist): Use it to read + lines.
* tests/records.scm ("recutils->alist with + lines"): New test.
* 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.
Ludovic Courtès